diff --git a/deps/ngtcp2/nghttp3/lib/includes/nghttp3/nghttp3.h b/deps/ngtcp2/nghttp3/lib/includes/nghttp3/nghttp3.h
index 6cf947487bf..bcf5ece79e4 100644
--- a/deps/ngtcp2/nghttp3/lib/includes/nghttp3/nghttp3.h
+++ b/deps/ngtcp2/nghttp3/lib/includes/nghttp3/nghttp3.h
@@ -2106,7 +2106,7 @@ NGHTTP3_EXTERN int nghttp3_conn_bind_qpack_streams(nghttp3_conn *conn,
  * control credit (both stream and connection) of underlying QUIC
  * connection by that amount.  It does not include the amount of data
  * carried by DATA frame which contains application data (excluding
- * any control or QPACK unidirectional streams) .  See
+ * any control or QPACK unidirectional streams).  See
  * :type:`nghttp3_recv_data` to handle those bytes.  If |fin| is
  * nonzero, this is the last data from remote endpoint in this stream.
  *
@@ -2480,8 +2480,6 @@ typedef struct nghttp3_data_reader {
  * This function returns 0 if it succeeds, or one of the following
  * negative error codes:
  *
- * :macro:`NGHTTP3_ERR_INVALID_ARGUMENT`
- *     |stream_id| identifies unidirectional stream.
  * :macro:`NGHTTP3_ERR_CONN_CLOSING`
  *     Connection is shutting down, and no new stream is allowed.
  * :macro:`NGHTTP3_ERR_STREAM_IN_USE`
diff --git a/deps/ngtcp2/nghttp3/lib/includes/nghttp3/version.h b/deps/ngtcp2/nghttp3/lib/includes/nghttp3/version.h
index 7f6cb8acffe..4061c155876 100644
--- a/deps/ngtcp2/nghttp3/lib/includes/nghttp3/version.h
+++ b/deps/ngtcp2/nghttp3/lib/includes/nghttp3/version.h
@@ -31,7 +31,7 @@
  *
  * Version number of the nghttp3 library release.
  */
-#define NGHTTP3_VERSION "1.6.0"
+#define NGHTTP3_VERSION "1.10.1"
 
 /**
  * @macro
@@ -41,6 +41,6 @@
  * number, 8 bits for minor and 8 bits for patch. Version 1.2.3
  * becomes 0x010203.
  */
-#define NGHTTP3_VERSION_NUM 0x010600
+#define NGHTTP3_VERSION_NUM 0x010a01
 
 #endif /* !defined(NGHTTP3_VERSION_H) */
diff --git a/deps/ngtcp2/nghttp3/lib/nghttp3_buf.c b/deps/ngtcp2/nghttp3/lib/nghttp3_buf.c
index aae075a73cc..57cf744680e 100644
--- a/deps/ngtcp2/nghttp3/lib/nghttp3_buf.c
+++ b/deps/ngtcp2/nghttp3/lib/nghttp3_buf.c
@@ -50,6 +50,10 @@ size_t nghttp3_buf_cap(const nghttp3_buf *buf) {
   return (size_t)(buf->end - buf->begin);
 }
 
+size_t nghttp3_buf_offset(const nghttp3_buf *buf) {
+  return (size_t)(buf->pos - buf->begin);
+}
+
 void nghttp3_buf_reset(nghttp3_buf *buf) { buf->pos = buf->last = buf->begin; }
 
 int nghttp3_buf_reserve(nghttp3_buf *buf, size_t size, const nghttp3_mem *mem) {
@@ -87,4 +91,12 @@ void nghttp3_typed_buf_init(nghttp3_typed_buf *tbuf, const nghttp3_buf *buf,
                             nghttp3_buf_type type) {
   tbuf->buf = *buf;
   tbuf->type = type;
+  tbuf->buf.begin = tbuf->buf.pos;
+}
+
+void nghttp3_typed_buf_shared_init(nghttp3_typed_buf *tbuf,
+                                   const nghttp3_buf *chunk) {
+  tbuf->buf = *chunk;
+  tbuf->type = NGHTTP3_BUF_TYPE_SHARED;
+  tbuf->buf.begin = tbuf->buf.pos = tbuf->buf.last;
 }
diff --git a/deps/ngtcp2/nghttp3/lib/nghttp3_buf.h b/deps/ngtcp2/nghttp3/lib/nghttp3_buf.h
index 9fa067de91b..c7abd0d3af7 100644
--- a/deps/ngtcp2/nghttp3/lib/nghttp3_buf.h
+++ b/deps/ngtcp2/nghttp3/lib/nghttp3_buf.h
@@ -42,6 +42,12 @@ void nghttp3_buf_wrap_init(nghttp3_buf *buf, uint8_t *src, size_t len);
  */
 size_t nghttp3_buf_cap(const nghttp3_buf *buf);
 
+/*
+ * nghttp3_buf_offset returns the distance from tbuf->begin to
+ * tbuf->pos.  In other words, it returns buf->pos - buf->begin.
+ */
+size_t nghttp3_buf_offset(const nghttp3_buf *buf);
+
 int nghttp3_buf_reserve(nghttp3_buf *buf, size_t size, const nghttp3_mem *mem);
 
 /*
@@ -69,6 +75,13 @@ typedef struct nghttp3_typed_buf {
 void nghttp3_typed_buf_init(nghttp3_typed_buf *tbuf, const nghttp3_buf *buf,
                             nghttp3_buf_type type);
 
+/*
+ * nghttp3_typed_buf_shared_init initializes |tbuf| of type
+ * NGHTTP3_BUF_TYPE_SHARED.
+ */
+void nghttp3_typed_buf_shared_init(nghttp3_typed_buf *tbuf,
+                                   const nghttp3_buf *chunk);
+
 void nghttp3_typed_buf_free(nghttp3_typed_buf *tbuf);
 
 #endif /* !defined(NGHTTP3_BUF_H) */
diff --git a/deps/ngtcp2/nghttp3/lib/nghttp3_conn.c b/deps/ngtcp2/nghttp3/lib/nghttp3_conn.c
index f70b4f5472d..1eec936a895 100644
--- a/deps/ngtcp2/nghttp3/lib/nghttp3_conn.c
+++ b/deps/ngtcp2/nghttp3/lib/nghttp3_conn.c
@@ -39,7 +39,7 @@
    dynamic table capacity that QPACK encoder is willing to use. */
 #define NGHTTP3_QPACK_ENCODER_MAX_DTABLE_CAPACITY 4096
 
-nghttp3_objalloc_def(chunk, nghttp3_chunk, oplent);
+nghttp3_objalloc_def(chunk, nghttp3_chunk, oplent)
 
 /*
  * conn_remote_stream_uni returns nonzero if |stream_id| is remote
@@ -233,12 +233,16 @@ static int conn_new(nghttp3_conn **pconn, int server, int callbacks_version,
                     const nghttp3_callbacks *callbacks, int settings_version,
                     const nghttp3_settings *settings, const nghttp3_mem *mem,
                     void *user_data) {
-  int rv;
   nghttp3_conn *conn;
   size_t i;
   (void)callbacks_version;
   (void)settings_version;
 
+  assert(settings->max_field_section_size <= NGHTTP3_VARINT_MAX);
+  assert(settings->qpack_max_dtable_capacity <= NGHTTP3_VARINT_MAX);
+  assert(settings->qpack_encoder_max_dtable_capacity <= NGHTTP3_VARINT_MAX);
+  assert(settings->qpack_blocked_streams <= NGHTTP3_VARINT_MAX);
+
   if (mem == NULL) {
     mem = nghttp3_mem_default();
   }
@@ -254,18 +258,11 @@ static int conn_new(nghttp3_conn **pconn, int server, int callbacks_version,
 
   nghttp3_map_init(&conn->streams, mem);
 
-  rv =
-    nghttp3_qpack_decoder_init(&conn->qdec, settings->qpack_max_dtable_capacity,
-                               settings->qpack_blocked_streams, mem);
-  if (rv != 0) {
-    goto qdec_init_fail;
-  }
+  nghttp3_qpack_decoder_init(&conn->qdec, settings->qpack_max_dtable_capacity,
+                             settings->qpack_blocked_streams, mem);
 
-  rv = nghttp3_qpack_encoder_init(
-    &conn->qenc, settings->qpack_encoder_max_dtable_capacity, mem);
-  if (rv != 0) {
-    goto qenc_init_fail;
-  }
+  nghttp3_qpack_encoder_init(&conn->qenc,
+                             settings->qpack_encoder_max_dtable_capacity, mem);
 
   nghttp3_pq_init(&conn->qpack_blocked_streams, ricnt_less, mem);
 
@@ -291,16 +288,6 @@ static int conn_new(nghttp3_conn **pconn, int server, int callbacks_version,
   *pconn = conn;
 
   return 0;
-
-qenc_init_fail:
-  nghttp3_qpack_decoder_free(&conn->qdec);
-qdec_init_fail:
-  nghttp3_map_free(&conn->streams);
-  nghttp3_objalloc_free(&conn->stream_objalloc);
-  nghttp3_objalloc_free(&conn->out_chunk_objalloc);
-  nghttp3_mem_free(mem, conn);
-
-  return rv;
 }
 
 int nghttp3_conn_client_new_versioned(nghttp3_conn **pconn,
@@ -399,6 +386,9 @@ nghttp3_ssize nghttp3_conn_read_stream(nghttp3_conn *conn, int64_t stream_id,
   size_t bidi_nproc;
   int rv;
 
+  assert(stream_id >= 0);
+  assert(stream_id <= (int64_t)NGHTTP3_MAX_VARINT);
+
   stream = nghttp3_conn_find_stream(conn, stream_id);
   if (stream == NULL) {
     /* TODO Assert idtr */
@@ -434,6 +424,10 @@ nghttp3_ssize nghttp3_conn_read_stream(nghttp3_conn *conn, int64_t stream_id,
             return rv;
           }
         }
+      } else if (!nghttp3_client_stream_uni(stream_id)) {
+        /* server does not expect to receive new server initiated
+           bidirectional or unidirectional stream from client. */
+        return NGHTTP3_ERR_H3_STREAM_CREATION_ERROR;
       } else {
         /* unidirectional stream */
         if (srclen == 0 && fin) {
@@ -448,7 +442,7 @@ nghttp3_ssize nghttp3_conn_read_stream(nghttp3_conn *conn, int64_t stream_id,
 
       stream->rx.hstate = NGHTTP3_HTTP_STATE_REQ_INITIAL;
       stream->tx.hstate = NGHTTP3_HTTP_STATE_REQ_INITIAL;
-    } else if (nghttp3_stream_uni(stream_id)) {
+    } else if (nghttp3_server_stream_uni(stream_id)) {
       if (srclen == 0 && fin) {
         return 0;
       }
@@ -461,17 +455,16 @@ nghttp3_ssize nghttp3_conn_read_stream(nghttp3_conn *conn, int64_t stream_id,
       stream->rx.hstate = NGHTTP3_HTTP_STATE_RESP_INITIAL;
       stream->tx.hstate = NGHTTP3_HTTP_STATE_RESP_INITIAL;
     } else {
-      /* client doesn't expect to receive new bidirectional stream
-         from server. */
+      /* client doesn't expect to receive new bidirectional stream or
+         client initiated unidirectional stream from server. */
       return NGHTTP3_ERR_H3_STREAM_CREATION_ERROR;
     }
   } else if (conn->server) {
-    if (nghttp3_client_stream_bidi(stream_id)) {
-      if (stream->rx.hstate == NGHTTP3_HTTP_STATE_NONE) {
-        stream->rx.hstate = NGHTTP3_HTTP_STATE_REQ_INITIAL;
-        stream->tx.hstate = NGHTTP3_HTTP_STATE_REQ_INITIAL;
-      }
-    }
+    assert(nghttp3_client_stream_bidi(stream_id) ||
+           nghttp3_client_stream_uni(stream_id));
+  } else {
+    assert(nghttp3_client_stream_bidi(stream_id) ||
+           nghttp3_server_stream_uni(stream_id));
   }
 
   if (srclen == 0 && !fin) {
@@ -608,6 +601,9 @@ nghttp3_ssize nghttp3_conn_read_uni(nghttp3_conn *conn, nghttp3_stream *stream,
     break;
   case NGHTTP3_STREAM_TYPE_UNKNOWN:
     nconsumed = (nghttp3_ssize)srclen;
+    if (fin) {
+      break;
+    }
 
     rv = conn_call_stop_sending(conn, stream, NGHTTP3_H3_STREAM_CREATION_ERROR);
     if (rv != 0) {
@@ -665,7 +661,7 @@ nghttp3_ssize nghttp3_conn_read_control(nghttp3_conn *conn,
       nghttp3_varint_read_state_reset(rvint);
       rstate->state = NGHTTP3_CTRL_STREAM_STATE_FRAME_LENGTH;
       if (p == end) {
-        break;
+        return (nghttp3_ssize)nconsumed;
       }
       /* Fall through */
     case NGHTTP3_CTRL_STREAM_STATE_FRAME_LENGTH:
@@ -973,6 +969,10 @@ nghttp3_ssize nghttp3_conn_read_control(nghttp3_conn *conn,
 
       rstate->state = NGHTTP3_CTRL_STREAM_STATE_PRIORITY_UPDATE;
 
+      if (p == end) {
+        return (nghttp3_ssize)nconsumed;
+      }
+
       /* Fall through */
     case NGHTTP3_CTRL_STREAM_STATE_PRIORITY_UPDATE:
       /* We need to buffer Priority Field Value because it might be
@@ -1792,6 +1792,8 @@ conn_on_priority_update_stream(nghttp3_conn *conn,
 
     stream->node.pri = fr->pri;
     stream->flags |= NGHTTP3_STREAM_FLAG_PRIORITY_UPDATE_RECVED;
+    stream->rx.hstate = NGHTTP3_HTTP_STATE_REQ_INITIAL;
+    stream->tx.hstate = NGHTTP3_HTTP_STATE_REQ_INITIAL;
 
     return 0;
   }
@@ -1836,7 +1838,7 @@ int nghttp3_conn_create_stream(nghttp3_conn *conn, nghttp3_stream **pstream,
   nghttp3_stream *stream;
   int rv;
   nghttp3_stream_callbacks callbacks = {
-    conn_stream_acked_data,
+    .acked_data = conn_stream_acked_data,
   };
 
   rv = nghttp3_stream_new(&stream, stream_id, &callbacks,
@@ -1874,6 +1876,8 @@ int nghttp3_conn_bind_control_stream(nghttp3_conn *conn, int64_t stream_id) {
   nghttp3_frame_entry frent;
   int rv;
 
+  assert(stream_id >= 0);
+  assert(stream_id <= (int64_t)NGHTTP3_MAX_VARINT);
   assert(!conn->server || nghttp3_server_stream_uni(stream_id));
   assert(conn->server || nghttp3_client_stream_uni(stream_id));
 
@@ -1906,6 +1910,10 @@ int nghttp3_conn_bind_qpack_streams(nghttp3_conn *conn, int64_t qenc_stream_id,
   nghttp3_stream *stream;
   int rv;
 
+  assert(qenc_stream_id >= 0);
+  assert(qenc_stream_id <= (int64_t)NGHTTP3_MAX_VARINT);
+  assert(qdec_stream_id >= 0);
+  assert(qdec_stream_id <= (int64_t)NGHTTP3_MAX_VARINT);
   assert(!conn->server || nghttp3_server_stream_uni(qenc_stream_id));
   assert(!conn->server || nghttp3_server_stream_uni(qdec_stream_id));
   assert(conn->server || nghttp3_client_stream_uni(qenc_stream_id));
@@ -2194,13 +2202,11 @@ int nghttp3_conn_submit_request(nghttp3_conn *conn, int64_t stream_id,
   assert(!conn->server);
   assert(conn->tx.qenc);
 
+  assert(stream_id >= 0);
+  assert(stream_id <= (int64_t)NGHTTP3_MAX_VARINT);
   assert(nghttp3_client_stream_bidi(stream_id));
 
-  /* TODO Should we check that stream_id is client stream_id? */
   /* TODO Check GOAWAY last stream ID */
-  if (nghttp3_stream_uni(stream_id)) {
-    return NGHTTP3_ERR_INVALID_ARGUMENT;
-  }
 
   if (conn->flags & NGHTTP3_CONN_FLAG_GOAWAY_RECVED) {
     return NGHTTP3_ERR_CONN_CLOSING;
@@ -2454,6 +2460,9 @@ int nghttp3_conn_close_stream(nghttp3_conn *conn, int64_t stream_id,
 int nghttp3_conn_shutdown_stream_read(nghttp3_conn *conn, int64_t stream_id) {
   nghttp3_stream *stream;
 
+  assert(stream_id >= 0);
+  assert(stream_id <= (int64_t)NGHTTP3_MAX_VARINT);
+
   if (!nghttp3_client_stream_bidi(stream_id)) {
     return 0;
   }
@@ -2515,6 +2524,9 @@ uint64_t nghttp3_conn_get_frame_payload_left(nghttp3_conn *conn,
   nghttp3_stream *stream;
   int uni = 0;
 
+  assert(stream_id >= 0);
+  assert(stream_id <= (int64_t)NGHTTP3_MAX_VARINT);
+
   if (!nghttp3_client_stream_bidi(stream_id)) {
     uni = conn_remote_stream_uni(conn, stream_id);
     if (!uni) {
@@ -2542,6 +2554,8 @@ int nghttp3_conn_get_stream_priority_versioned(nghttp3_conn *conn,
   (void)pri_version;
 
   assert(conn->server);
+  assert(stream_id >= 0);
+  assert(stream_id <= (int64_t)NGHTTP3_MAX_VARINT);
 
   if (!nghttp3_client_stream_bidi(stream_id)) {
     return NGHTTP3_ERR_INVALID_ARGUMENT;
@@ -2566,6 +2580,8 @@ int nghttp3_conn_set_client_stream_priority(nghttp3_conn *conn,
   uint8_t *buf = NULL;
 
   assert(!conn->server);
+  assert(stream_id >= 0);
+  assert(stream_id <= (int64_t)NGHTTP3_MAX_VARINT);
 
   if (!nghttp3_client_stream_bidi(stream_id)) {
     return NGHTTP3_ERR_INVALID_ARGUMENT;
@@ -2603,6 +2619,8 @@ int nghttp3_conn_set_server_stream_priority_versioned(nghttp3_conn *conn,
   assert(conn->server);
   assert(pri->urgency < NGHTTP3_URGENCY_LEVELS);
   assert(pri->inc == 0 || pri->inc == 1);
+  assert(stream_id >= 0);
+  assert(stream_id <= (int64_t)NGHTTP3_MAX_VARINT);
 
   if (!nghttp3_client_stream_bidi(stream_id)) {
     return NGHTTP3_ERR_INVALID_ARGUMENT;
diff --git a/deps/ngtcp2/nghttp3/lib/nghttp3_conn.h b/deps/ngtcp2/nghttp3/lib/nghttp3_conn.h
index 1218ba508ba..3ab6d34422f 100644
--- a/deps/ngtcp2/nghttp3/lib/nghttp3_conn.h
+++ b/deps/ngtcp2/nghttp3/lib/nghttp3_conn.h
@@ -76,7 +76,7 @@ typedef struct nghttp3_chunk {
   nghttp3_opl_entry oplent;
 } nghttp3_chunk;
 
-nghttp3_objalloc_decl(chunk, nghttp3_chunk, oplent);
+nghttp3_objalloc_decl(chunk, nghttp3_chunk, oplent)
 
 struct nghttp3_conn {
   nghttp3_objalloc out_chunk_objalloc;
diff --git a/deps/ngtcp2/nghttp3/lib/nghttp3_conv.c b/deps/ngtcp2/nghttp3/lib/nghttp3_conv.c
index 6439a6d7829..9b32ca3f405 100644
--- a/deps/ngtcp2/nghttp3/lib/nghttp3_conv.c
+++ b/deps/ngtcp2/nghttp3/lib/nghttp3_conv.c
@@ -66,8 +66,6 @@ const uint8_t *nghttp3_get_varint(int64_t *dest, const uint8_t *p) {
   }
 }
 
-int64_t nghttp3_get_varint_fb(const uint8_t *p) { return *p & 0x3f; }
-
 size_t nghttp3_get_varintlen(const uint8_t *p) {
   return (size_t)(1u << (*p >> 6));
 }
diff --git a/deps/ngtcp2/nghttp3/lib/nghttp3_conv.h b/deps/ngtcp2/nghttp3/lib/nghttp3_conv.h
index 40f5d4de782..f70802ce600 100644
--- a/deps/ngtcp2/nghttp3/lib/nghttp3_conv.h
+++ b/deps/ngtcp2/nghttp3/lib/nghttp3_conv.h
@@ -135,12 +135,6 @@ STIN uint16_t ntohs(uint16_t netshort) {
  */
 const uint8_t *nghttp3_get_varint(int64_t *dest, const uint8_t *p);
 
-/*
- * nghttp3_get_varint_fb reads first byte of encoded variable-length
- * integer from |p|.
- */
-int64_t nghttp3_get_varint_fb(const uint8_t *p);
-
 /*
  * nghttp3_get_varintlen returns the required number of bytes to read
  * variable-length integer starting at |p|.
diff --git a/deps/ngtcp2/nghttp3/lib/nghttp3_gaptr.c b/deps/ngtcp2/nghttp3/lib/nghttp3_gaptr.c
index 20eed5faa2b..e8ab509c8f9 100644
--- a/deps/ngtcp2/nghttp3/lib/nghttp3_gaptr.c
+++ b/deps/ngtcp2/nghttp3/lib/nghttp3_gaptr.c
@@ -29,14 +29,16 @@
 #include <assert.h>
 
 void nghttp3_gaptr_init(nghttp3_gaptr *gaptr, const nghttp3_mem *mem) {
-  nghttp3_ksl_init(&gaptr->gap, nghttp3_ksl_range_compar, sizeof(nghttp3_range),
-                   mem);
+  nghttp3_ksl_init(&gaptr->gap, nghttp3_ksl_range_compar,
+                   nghttp3_ksl_range_search, sizeof(nghttp3_range), mem);
 
   gaptr->mem = mem;
 }
 
 static int gaptr_gap_init(nghttp3_gaptr *gaptr) {
-  nghttp3_range range = {0, UINT64_MAX};
+  nghttp3_range range = {
+    .end = UINT64_MAX,
+  };
 
   return nghttp3_ksl_insert(&gaptr->gap, NULL, &range, NULL);
 }
@@ -52,7 +54,11 @@ void nghttp3_gaptr_free(nghttp3_gaptr *gaptr) {
 int nghttp3_gaptr_push(nghttp3_gaptr *gaptr, uint64_t offset,
                        uint64_t datalen) {
   int rv;
-  nghttp3_range k, m, l, r, q = {offset, offset + datalen};
+  nghttp3_range k, m, l, r;
+  nghttp3_range q = {
+    .begin = offset,
+    .end = offset + datalen,
+  };
   nghttp3_ksl_it it;
 
   if (nghttp3_ksl_len(&gaptr->gap) == 0) {
@@ -62,8 +68,8 @@ int nghttp3_gaptr_push(nghttp3_gaptr *gaptr, uint64_t offset,
     }
   }
 
-  it = nghttp3_ksl_lower_bound_compar(&gaptr->gap, &q,
-                                      nghttp3_ksl_range_exclusive_compar);
+  it = nghttp3_ksl_lower_bound_search(&gaptr->gap, &q,
+                                      nghttp3_ksl_range_exclusive_search);
 
   for (; !nghttp3_ksl_it_end(&it);) {
     k = *(nghttp3_range *)nghttp3_ksl_it_key(&it);
@@ -112,7 +118,10 @@ uint64_t nghttp3_gaptr_first_gap_offset(nghttp3_gaptr *gaptr) {
 
 nghttp3_range nghttp3_gaptr_get_first_gap_after(nghttp3_gaptr *gaptr,
                                                 uint64_t offset) {
-  nghttp3_range q = {offset, offset + 1};
+  nghttp3_range q = {
+    .begin = offset,
+    .end = offset + 1,
+  };
   nghttp3_ksl_it it;
 
   if (nghttp3_ksl_len(&gaptr->gap) == 0) {
@@ -120,8 +129,8 @@ nghttp3_range nghttp3_gaptr_get_first_gap_after(nghttp3_gaptr *gaptr,
     return r;
   }
 
-  it = nghttp3_ksl_lower_bound_compar(&gaptr->gap, &q,
-                                      nghttp3_ksl_range_exclusive_compar);
+  it = nghttp3_ksl_lower_bound_search(&gaptr->gap, &q,
+                                      nghttp3_ksl_range_exclusive_search);
 
   assert(!nghttp3_ksl_it_end(&it));
 
@@ -130,7 +139,10 @@ nghttp3_range nghttp3_gaptr_get_first_gap_after(nghttp3_gaptr *gaptr,
 
 int nghttp3_gaptr_is_pushed(nghttp3_gaptr *gaptr, uint64_t offset,
                             uint64_t datalen) {
-  nghttp3_range q = {offset, offset + datalen};
+  nghttp3_range q = {
+    .begin = offset,
+    .end = offset + datalen,
+  };
   nghttp3_ksl_it it;
   nghttp3_range m;
 
@@ -138,8 +150,11 @@ int nghttp3_gaptr_is_pushed(nghttp3_gaptr *gaptr, uint64_t offset,
     return 0;
   }
 
-  it = nghttp3_ksl_lower_bound_compar(&gaptr->gap, &q,
-                                      nghttp3_ksl_range_exclusive_compar);
+  it = nghttp3_ksl_lower_bound_search(&gaptr->gap, &q,
+                                      nghttp3_ksl_range_exclusive_search);
+
+  assert(!nghttp3_ksl_it_end(&it));
+
   m = nghttp3_range_intersect(&q, (nghttp3_range *)nghttp3_ksl_it_key(&it));
 
   return nghttp3_range_len(&m) == 0;
diff --git a/deps/ngtcp2/nghttp3/lib/nghttp3_http.c b/deps/ngtcp2/nghttp3/lib/nghttp3_http.c
index 38092cfb7c3..9a8f06ea11d 100644
--- a/deps/ngtcp2/nghttp3/lib/nghttp3_http.c
+++ b/deps/ngtcp2/nghttp3/lib/nghttp3_http.c
@@ -69,11 +69,11 @@ static int64_t parse_uint(const uint8_t *s, size_t len) {
   }
   for (i = 0; i < len; ++i) {
     if ('0' <= s[i] && s[i] <= '9') {
-      if (n > INT64_MAX / 10) {
+      if (n > (int64_t)NGHTTP3_MAX_VARINT / 10) {
         return -1;
       }
       n *= 10;
-      if (n > INT64_MAX - (s[i] - '0')) {
+      if (n > (int64_t)NGHTTP3_MAX_VARINT - (s[i] - '0')) {
         return -1;
       }
       n += s[i] - '0';
@@ -124,17 +124,17 @@ static int is_ws(uint8_t c) {
 int nghttp3_http_parse_priority(nghttp3_pri *dest, const uint8_t *value,
                                 size_t valuelen) {
   nghttp3_pri pri = *dest;
-  sf_parser sfp;
-  sf_vec key;
-  sf_value val;
+  sfparse_parser sfp;
+  sfparse_vec key;
+  sfparse_value val;
   int rv;
 
-  sf_parser_init(&sfp, value, valuelen);
+  sfparse_parser_init(&sfp, value, valuelen);
 
   for (;;) {
-    rv = sf_parser_dict(&sfp, &key, &val);
+    rv = sfparse_parser_dict(&sfp, &key, &val);
     if (rv != 0) {
-      if (rv == SF_ERR_EOF) {
+      if (rv == SFPARSE_ERR_EOF) {
         break;
       }
 
@@ -147,7 +147,7 @@ int nghttp3_http_parse_priority(nghttp3_pri *dest, const uint8_t *value,
 
     switch (key.base[0]) {
     case 'i':
-      if (val.type != SF_TYPE_BOOLEAN) {
+      if (val.type != SFPARSE_TYPE_BOOLEAN) {
         return NGHTTP3_ERR_INVALID_ARGUMENT;
       }
 
@@ -155,7 +155,8 @@ int nghttp3_http_parse_priority(nghttp3_pri *dest, const uint8_t *value,
 
       break;
     case 'u':
-      if (val.type != SF_TYPE_INTEGER || val.integer < NGHTTP3_URGENCY_HIGH ||
+      if (val.type != SFPARSE_TYPE_INTEGER ||
+          val.integer < NGHTTP3_URGENCY_HIGH ||
           NGHTTP3_URGENCY_LOW < val.integer) {
         return NGHTTP3_ERR_INVALID_ARGUMENT;
       }
@@ -197,7 +198,7 @@ static char VALID_AUTHORITY_CHARS[] = {
   1 /* 4    */, 1 /* 5    */, 1 /* 6    */, 1 /* 7    */,
   1 /* 8    */, 1 /* 9    */, 1 /* :    */, 1 /* ;    */,
   0 /* <    */, 1 /* =    */, 0 /* >    */, 0 /* ?    */,
-  1 /* @    */, 1 /* A    */, 1 /* B    */, 1 /* C    */,
+  0 /* @    */, 1 /* A    */, 1 /* B    */, 1 /* C    */,
   1 /* D    */, 1 /* E    */, 1 /* F    */, 1 /* G    */,
   1 /* H    */, 1 /* I    */, 1 /* J    */, 1 /* K    */,
   1 /* L    */, 1 /* M    */, 1 /* N    */, 1 /* O    */,
@@ -548,6 +549,9 @@ static int http_request_on_header(nghttp3_http_state *http,
     break;
   case NGHTTP3_QPACK_TOKEN_PRIORITY:
     if (!nghttp3_check_header_value(nv->value->base, nv->value->len)) {
+      http->flags &= ~NGHTTP3_HTTP_FLAG_PRIORITY;
+      http->flags |= NGHTTP3_HTTP_FLAG_BAD_PRIORITY;
+
       return NGHTTP3_ERR_REMOVE_HTTP_HEADER;
     }
 
@@ -991,7 +995,11 @@ int nghttp3_check_header_value(const uint8_t *value, size_t len) {
   case 0:
     return 1;
   case 1:
-    return !is_ws(*value);
+    if (is_ws(*value)) {
+      return 0;
+    }
+
+    break;
   default:
     if (is_ws(*value) || is_ws(*(value + len - 1))) {
       return 0;
diff --git a/deps/ngtcp2/nghttp3/lib/nghttp3_ksl.c b/deps/ngtcp2/nghttp3/lib/nghttp3_ksl.c
index a3b5fbcb05f..33dec06388a 100644
--- a/deps/ngtcp2/nghttp3/lib/nghttp3_ksl.c
+++ b/deps/ngtcp2/nghttp3/lib/nghttp3_ksl.c
@@ -34,9 +34,9 @@
 #include "nghttp3_mem.h"
 #include "nghttp3_range.h"
 
-static nghttp3_ksl_blk null_blk = {{{NULL, NULL, 0, 0, {0}}}};
+static nghttp3_ksl_blk null_blk;
 
-nghttp3_objalloc_def(ksl_blk, nghttp3_ksl_blk, oplent);
+nghttp3_objalloc_def(ksl_blk, nghttp3_ksl_blk, oplent)
 
 static size_t ksl_nodelen(size_t keylen) {
   assert(keylen >= sizeof(uint64_t));
@@ -59,7 +59,8 @@ static void ksl_node_set_key(nghttp3_ksl *ksl, nghttp3_ksl_node *node,
 }
 
 void nghttp3_ksl_init(nghttp3_ksl *ksl, nghttp3_ksl_compar compar,
-                      size_t keylen, const nghttp3_mem *mem) {
+                      nghttp3_ksl_search search, size_t keylen,
+                      const nghttp3_mem *mem) {
   size_t nodelen = ksl_nodelen(keylen);
 
   nghttp3_objalloc_init(&ksl->blkalloc,
@@ -68,6 +69,7 @@ void nghttp3_ksl_init(nghttp3_ksl *ksl, nghttp3_ksl_compar compar,
   ksl->head = NULL;
   ksl->front = ksl->back = NULL;
   ksl->compar = compar;
+  ksl->search = search;
   ksl->n = 0;
   ksl->keylen = keylen;
   ksl->nodelen = nodelen;
@@ -274,20 +276,6 @@ static void ksl_insert_node(nghttp3_ksl *ksl, nghttp3_ksl_blk *blk, size_t i,
   ++blk->n;
 }
 
-static size_t ksl_search(const nghttp3_ksl *ksl, nghttp3_ksl_blk *blk,
-                         const nghttp3_ksl_key *key,
-                         nghttp3_ksl_compar compar) {
-  size_t i;
-  nghttp3_ksl_node *node;
-
-  for (i = 0, node = (nghttp3_ksl_node *)(void *)blk->nodes;
-       i < blk->n && compar((nghttp3_ksl_key *)node->key, key);
-       ++i, node = (nghttp3_ksl_node *)(void *)((uint8_t *)node + ksl->nodelen))
-    ;
-
-  return i;
-}
-
 int nghttp3_ksl_insert(nghttp3_ksl *ksl, nghttp3_ksl_it *it,
                        const nghttp3_ksl_key *key, void *data) {
   nghttp3_ksl_blk *blk;
@@ -312,7 +300,7 @@ int nghttp3_ksl_insert(nghttp3_ksl *ksl, nghttp3_ksl_it *it,
   blk = ksl->head;
 
   for (;;) {
-    i = ksl_search(ksl, blk, key, ksl->compar);
+    i = ksl->search(ksl, blk, key);
 
     if (blk->leaf) {
       if (i < blk->n &&
@@ -571,7 +559,7 @@ int nghttp3_ksl_remove(nghttp3_ksl *ksl, nghttp3_ksl_it *it,
   }
 
   for (;;) {
-    i = ksl_search(ksl, blk, key, ksl->compar);
+    i = ksl->search(ksl, blk, key);
 
     if (i == blk->n) {
       if (it) {
@@ -642,12 +630,12 @@ int nghttp3_ksl_remove(nghttp3_ksl *ksl, nghttp3_ksl_it *it,
 
 nghttp3_ksl_it nghttp3_ksl_lower_bound(const nghttp3_ksl *ksl,
                                        const nghttp3_ksl_key *key) {
-  return nghttp3_ksl_lower_bound_compar(ksl, key, ksl->compar);
+  return nghttp3_ksl_lower_bound_search(ksl, key, ksl->search);
 }
 
-nghttp3_ksl_it nghttp3_ksl_lower_bound_compar(const nghttp3_ksl *ksl,
+nghttp3_ksl_it nghttp3_ksl_lower_bound_search(const nghttp3_ksl *ksl,
                                               const nghttp3_ksl_key *key,
-                                              nghttp3_ksl_compar compar) {
+                                              nghttp3_ksl_search search) {
   nghttp3_ksl_blk *blk = ksl->head;
   nghttp3_ksl_it it;
   size_t i;
@@ -658,7 +646,7 @@ nghttp3_ksl_it nghttp3_ksl_lower_bound_compar(const nghttp3_ksl *ksl,
   }
 
   for (;;) {
-    i = ksl_search(ksl, blk, key, compar);
+    i = search(ksl, blk, key);
 
     if (blk->leaf) {
       if (i == blk->n && blk->next) {
@@ -702,7 +690,7 @@ void nghttp3_ksl_update_key(nghttp3_ksl *ksl, const nghttp3_ksl_key *old_key,
   assert(ksl->head);
 
   for (;;) {
-    i = ksl_search(ksl, blk, old_key, ksl->compar);
+    i = ksl->search(ksl, blk, old_key);
 
     assert(i < blk->n);
     node = nghttp3_ksl_nth_node(ksl, blk, i);
@@ -825,9 +813,50 @@ int nghttp3_ksl_range_compar(const nghttp3_ksl_key *lhs,
   return a->begin < b->begin;
 }
 
+nghttp3_ksl_search_def(range, nghttp3_ksl_range_compar)
+
+size_t nghttp3_ksl_range_search(const nghttp3_ksl *ksl, nghttp3_ksl_blk *blk,
+                                const nghttp3_ksl_key *key) {
+  return ksl_range_search(ksl, blk, key);
+}
+
 int nghttp3_ksl_range_exclusive_compar(const nghttp3_ksl_key *lhs,
                                        const nghttp3_ksl_key *rhs) {
   const nghttp3_range *a = lhs, *b = rhs;
   return a->begin < b->begin && !(nghttp3_max_uint64(a->begin, b->begin) <
                                   nghttp3_min_uint64(a->end, b->end));
 }
+
+nghttp3_ksl_search_def(range_exclusive, nghttp3_ksl_range_exclusive_compar)
+
+size_t nghttp3_ksl_range_exclusive_search(const nghttp3_ksl *ksl,
+                                          nghttp3_ksl_blk *blk,
+                                          const nghttp3_ksl_key *key) {
+  return ksl_range_exclusive_search(ksl, blk, key);
+}
+
+int nghttp3_ksl_uint64_less(const nghttp3_ksl_key *lhs,
+                            const nghttp3_ksl_key *rhs) {
+  return *(uint64_t *)lhs < *(uint64_t *)rhs;
+}
+
+nghttp3_ksl_search_def(uint64_less, nghttp3_ksl_uint64_less)
+
+size_t nghttp3_ksl_uint64_less_search(const nghttp3_ksl *ksl,
+                                      nghttp3_ksl_blk *blk,
+                                      const nghttp3_ksl_key *key) {
+  return ksl_uint64_less_search(ksl, blk, key);
+}
+
+int nghttp3_ksl_int64_greater(const nghttp3_ksl_key *lhs,
+                              const nghttp3_ksl_key *rhs) {
+  return *(int64_t *)lhs > *(int64_t *)rhs;
+}
+
+nghttp3_ksl_search_def(int64_greater, nghttp3_ksl_int64_greater)
+
+size_t nghttp3_ksl_int64_greater_search(const nghttp3_ksl *ksl,
+                                        nghttp3_ksl_blk *blk,
+                                        const nghttp3_ksl_key *key) {
+  return ksl_int64_greater_search(ksl, blk, key);
+}
diff --git a/deps/ngtcp2/nghttp3/lib/nghttp3_ksl.h b/deps/ngtcp2/nghttp3/lib/nghttp3_ksl.h
index e15e227ce50..d0ce8cd664d 100644
--- a/deps/ngtcp2/nghttp3/lib/nghttp3_ksl.h
+++ b/deps/ngtcp2/nghttp3/lib/nghttp3_ksl.h
@@ -104,7 +104,7 @@ struct nghttp3_ksl_blk {
   };
 };
 
-nghttp3_objalloc_decl(ksl_blk, nghttp3_ksl_blk, oplent);
+nghttp3_objalloc_decl(ksl_blk, nghttp3_ksl_blk, oplent)
 
 /*
  * nghttp3_ksl_compar is a function type which returns nonzero if key
@@ -115,6 +115,35 @@ typedef int (*nghttp3_ksl_compar)(const nghttp3_ksl_key *lhs,
 
 typedef struct nghttp3_ksl nghttp3_ksl;
 
+/*
+ * nghttp3_ksl_search is a function to search for the first element in
+ * |blk|->nodes which is not ordered before |key|.  It returns the
+ * index of such element.  It returns |blk|->n if there is no such
+ * element.
+ */
+typedef size_t (*nghttp3_ksl_search)(const nghttp3_ksl *ksl,
+                                     nghttp3_ksl_blk *blk,
+                                     const nghttp3_ksl_key *key);
+
+/*
+ * nghttp3_ksl_search_def is a macro to implement nghttp3_ksl_search
+ * with COMPAR which is supposed to be nghttp3_ksl_compar.
+ */
+#define nghttp3_ksl_search_def(NAME, COMPAR)                                   \
+  static size_t ksl_##NAME##_search(const nghttp3_ksl *ksl,                    \
+                                    nghttp3_ksl_blk *blk,                      \
+                                    const nghttp3_ksl_key *key) {              \
+    size_t i;                                                                  \
+    nghttp3_ksl_node *node;                                                    \
+                                                                               \
+    for (i = 0, node = (nghttp3_ksl_node *)(void *)blk->nodes;                 \
+         i < blk->n && COMPAR((nghttp3_ksl_key *)node->key, key); ++i,         \
+        node = (nghttp3_ksl_node *)(void *)((uint8_t *)node + ksl->nodelen))   \
+      ;                                                                        \
+                                                                               \
+    return i;                                                                  \
+  }
+
 typedef struct nghttp3_ksl_it nghttp3_ksl_it;
 
 /*
@@ -138,6 +167,7 @@ struct nghttp3_ksl {
   /* back points to the last leaf block. */
   nghttp3_ksl_blk *back;
   nghttp3_ksl_compar compar;
+  nghttp3_ksl_search search;
   /* n is the number of elements stored. */
   size_t n;
   /* keylen is the size of key */
@@ -149,11 +179,13 @@ struct nghttp3_ksl {
 
 /*
  * nghttp3_ksl_init initializes |ksl|.  |compar| specifies compare
- * function.  |keylen| is the length of key and must be at least
+ * function.  |search| is a search function which must use |compar|.
+ * |keylen| is the length of key and must be at least
  * sizeof(uint64_t).
  */
 void nghttp3_ksl_init(nghttp3_ksl *ksl, nghttp3_ksl_compar compar,
-                      size_t keylen, const nghttp3_mem *mem);
+                      nghttp3_ksl_search search, size_t keylen,
+                      const nghttp3_mem *mem);
 
 /*
  * nghttp3_ksl_free frees resources allocated for |ksl|.  If |ksl| is
@@ -218,12 +250,12 @@ nghttp3_ksl_it nghttp3_ksl_lower_bound(const nghttp3_ksl *ksl,
                                        const nghttp3_ksl_key *key);
 
 /*
- * nghttp3_ksl_lower_bound_compar works like nghttp3_ksl_lower_bound,
- * but it takes custom function |compar| to do lower bound search.
+ * nghttp3_ksl_lower_bound_search works like nghttp3_ksl_lower_bound,
+ * but it takes custom function |search| to do lower bound search.
  */
-nghttp3_ksl_it nghttp3_ksl_lower_bound_compar(const nghttp3_ksl *ksl,
+nghttp3_ksl_it nghttp3_ksl_lower_bound_search(const nghttp3_ksl *ksl,
                                               const nghttp3_ksl_key *key,
-                                              nghttp3_ksl_compar compar);
+                                              nghttp3_ksl_search search);
 
 /*
  * nghttp3_ksl_update_key replaces the key of nodes which has
@@ -330,22 +362,69 @@ int nghttp3_ksl_it_begin(const nghttp3_ksl_it *it);
 
 /*
  * nghttp3_ksl_range_compar is an implementation of
- * nghttp3_ksl_compar.  lhs->ptr and rhs->ptr must point to
- * nghttp3_range object and the function returns nonzero if (const
- * nghttp3_range *)(lhs->ptr)->begin < (const nghttp3_range
- * *)(rhs->ptr)->begin.
+ * nghttp3_ksl_compar.  |lhs| and |rhs| must point to nghttp3_range
+ * object, and the function returns nonzero if ((const nghttp3_range
+ * *)lhs)->begin < ((const nghttp3_range *)rhs)->begin.
  */
 int nghttp3_ksl_range_compar(const nghttp3_ksl_key *lhs,
                              const nghttp3_ksl_key *rhs);
 
+/*
+ * nghttp3_ksl_range_search is an implementation of nghttp3_ksl_search
+ * that uses nghttp3_ksl_range_compar.
+ */
+size_t nghttp3_ksl_range_search(const nghttp3_ksl *ksl, nghttp3_ksl_blk *blk,
+                                const nghttp3_ksl_key *key);
+
 /*
  * nghttp3_ksl_range_exclusive_compar is an implementation of
- * nghttp3_ksl_compar.  lhs->ptr and rhs->ptr must point to
- * nghttp3_range object and the function returns nonzero if (const
- * nghttp3_range *)(lhs->ptr)->begin < (const nghttp3_range
- * *)(rhs->ptr)->begin and the 2 ranges do not intersect.
+ * nghttp3_ksl_compar.  |lhs| and |rhs| must point to nghttp3_range
+ * object, and the function returns nonzero if ((const nghttp3_range
+ * *)lhs)->begin < ((const nghttp3_range *)rhs)->begin, and the 2
+ * ranges do not intersect.
  */
 int nghttp3_ksl_range_exclusive_compar(const nghttp3_ksl_key *lhs,
                                        const nghttp3_ksl_key *rhs);
 
+/*
+ * nghttp3_ksl_range_exclusive_search is an implementation of
+ * nghttp3_ksl_search that uses nghttp3_ksl_range_exclusive_compar.
+ */
+size_t nghttp3_ksl_range_exclusive_search(const nghttp3_ksl *ksl,
+                                          nghttp3_ksl_blk *blk,
+                                          const nghttp3_ksl_key *key);
+
+/*
+ * nghttp3_ksl_uint64_less is an implementation of nghttp3_ksl_compar.
+ * |lhs| and |rhs| must point to uint64_t objects, and the function
+ * returns nonzero if *(uint64_t *)|lhs| < *(uint64_t *)|rhs|.
+ */
+int nghttp3_ksl_uint64_less(const nghttp3_ksl_key *lhs,
+                            const nghttp3_ksl_key *rhs);
+
+/*
+ * nghttp3_ksl_uint64_less_search is an implementation of
+ * nghttp3_ksl_search that uses nghttp3_ksl_uint64_less.
+ */
+size_t nghttp3_ksl_uint64_less_search(const nghttp3_ksl *ksl,
+                                      nghttp3_ksl_blk *blk,
+                                      const nghttp3_ksl_key *key);
+
+/*
+ * nghttp3_ksl_int64_greater is an implementation of
+ * nghttp3_ksl_compar.  |lhs| and |rhs| must point to int64_t objects,
+ * and the function returns nonzero if *(int64_t *)|lhs| > *(int64_t
+ * *)|rhs|.
+ */
+int nghttp3_ksl_int64_greater(const nghttp3_ksl_key *lhs,
+                              const nghttp3_ksl_key *rhs);
+
+/*
+ * nghttp3_ksl_int64_greater_search is an implementation of
+ * nghttp3_ksl_search that uses nghttp3_ksl_int64_greater.
+ */
+size_t nghttp3_ksl_int64_greater_search(const nghttp3_ksl *ksl,
+                                        nghttp3_ksl_blk *blk,
+                                        const nghttp3_ksl_key *key);
+
 #endif /* !defined(NGHTTP3_KSL_H) */
diff --git a/deps/ngtcp2/nghttp3/lib/nghttp3_macro.h b/deps/ngtcp2/nghttp3/lib/nghttp3_macro.h
index a4e1dfea3cd..ffe0ea70924 100644
--- a/deps/ngtcp2/nghttp3/lib/nghttp3_macro.h
+++ b/deps/ngtcp2/nghttp3/lib/nghttp3_macro.h
@@ -48,27 +48,27 @@
 #define nghttp3_max_def(SUFFIX, T)                                             \
   static inline T nghttp3_max_##SUFFIX(T a, T b) { return a < b ? b : a; }
 
-nghttp3_max_def(int8, int8_t);
-nghttp3_max_def(int16, int16_t);
-nghttp3_max_def(int32, int32_t);
-nghttp3_max_def(int64, int64_t);
-nghttp3_max_def(uint8, uint8_t);
-nghttp3_max_def(uint16, uint16_t);
-nghttp3_max_def(uint32, uint32_t);
-nghttp3_max_def(uint64, uint64_t);
-nghttp3_max_def(size, size_t);
+nghttp3_max_def(int8, int8_t)
+nghttp3_max_def(int16, int16_t)
+nghttp3_max_def(int32, int32_t)
+nghttp3_max_def(int64, int64_t)
+nghttp3_max_def(uint8, uint8_t)
+nghttp3_max_def(uint16, uint16_t)
+nghttp3_max_def(uint32, uint32_t)
+nghttp3_max_def(uint64, uint64_t)
+nghttp3_max_def(size, size_t)
 
 #define nghttp3_min_def(SUFFIX, T)                                             \
   static inline T nghttp3_min_##SUFFIX(T a, T b) { return a < b ? a : b; }
 
-nghttp3_min_def(int8, int8_t);
-nghttp3_min_def(int16, int16_t);
-nghttp3_min_def(int32, int32_t);
-nghttp3_min_def(int64, int64_t);
-nghttp3_min_def(uint8, uint8_t);
-nghttp3_min_def(uint16, uint16_t);
-nghttp3_min_def(uint32, uint32_t);
-nghttp3_min_def(uint64, uint64_t);
-nghttp3_min_def(size, size_t);
+nghttp3_min_def(int8, int8_t)
+nghttp3_min_def(int16, int16_t)
+nghttp3_min_def(int32, int32_t)
+nghttp3_min_def(int64, int64_t)
+nghttp3_min_def(uint8, uint8_t)
+nghttp3_min_def(uint16, uint16_t)
+nghttp3_min_def(uint32, uint32_t)
+nghttp3_min_def(uint64, uint64_t)
+nghttp3_min_def(size, size_t)
 
 #endif /* !defined(NGHTTP3_MACRO_H) */
diff --git a/deps/ngtcp2/nghttp3/lib/nghttp3_map.c b/deps/ngtcp2/nghttp3/lib/nghttp3_map.c
index cc5e42a2caf..829f9e83eeb 100644
--- a/deps/ngtcp2/nghttp3/lib/nghttp3_map.c
+++ b/deps/ngtcp2/nghttp3/lib/nghttp3_map.c
@@ -120,7 +120,11 @@ void nghttp3_map_print_distance(const nghttp3_map *map) {
 static int insert(nghttp3_map_bucket *table, size_t hashbits,
                   nghttp3_map_key_type key, void *data) {
   size_t idx = hash(key, hashbits);
-  nghttp3_map_bucket b = {0, key, data}, *bkt;
+  nghttp3_map_bucket b = {
+    .key = key,
+    .data = data,
+  };
+  nghttp3_map_bucket *bkt;
   size_t mask = (1u << hashbits) - 1;
 
   for (;;) {
diff --git a/deps/ngtcp2/nghttp3/lib/nghttp3_pq.c b/deps/ngtcp2/nghttp3/lib/nghttp3_pq.c
index feefcd6fc71..e35bcac4e43 100644
--- a/deps/ngtcp2/nghttp3/lib/nghttp3_pq.c
+++ b/deps/ngtcp2/nghttp3/lib/nghttp3_pq.c
@@ -164,20 +164,4 @@ int nghttp3_pq_empty(const nghttp3_pq *pq) { return pq->length == 0; }
 
 size_t nghttp3_pq_size(const nghttp3_pq *pq) { return pq->length; }
 
-int nghttp3_pq_each(const nghttp3_pq *pq, nghttp3_pq_item_cb fun, void *arg) {
-  size_t i;
-
-  if (pq->length == 0) {
-    return 0;
-  }
-
-  for (i = 0; i < pq->length; ++i) {
-    if ((*fun)(pq->q[i], arg)) {
-      return 1;
-    }
-  }
-
-  return 0;
-}
-
 void nghttp3_pq_clear(nghttp3_pq *pq) { pq->length = 0; }
diff --git a/deps/ngtcp2/nghttp3/lib/nghttp3_pq.h b/deps/ngtcp2/nghttp3/lib/nghttp3_pq.h
index 3813b529473..c4e47b16708 100644
--- a/deps/ngtcp2/nghttp3/lib/nghttp3_pq.h
+++ b/deps/ngtcp2/nghttp3/lib/nghttp3_pq.h
@@ -112,17 +112,6 @@ int nghttp3_pq_empty(const nghttp3_pq *pq);
  */
 size_t nghttp3_pq_size(const nghttp3_pq *pq);
 
-typedef int (*nghttp3_pq_item_cb)(nghttp3_pq_entry *item, void *arg);
-
-/*
- * nghttp3_pq_each applies |fun| to each item in |pq|.  The |arg| is
- * passed as arg parameter to callback function.  This function must
- * not change the ordering key.  If the return value from callback is
- * nonzero, this function returns 1 immediately without iterating
- * remaining items.  Otherwise this function returns 0.
- */
-int nghttp3_pq_each(const nghttp3_pq *pq, nghttp3_pq_item_cb fun, void *arg);
-
 /*
  * nghttp3_pq_remove removes |item| from |pq|.  |pq| must contain
  * |item| otherwise the behavior is undefined.
diff --git a/deps/ngtcp2/nghttp3/lib/nghttp3_qpack.c b/deps/ngtcp2/nghttp3/lib/nghttp3_qpack.c
index a1c7e7487c1..c41fc53b8f5 100644
--- a/deps/ngtcp2/nghttp3/lib/nghttp3_qpack.c
+++ b/deps/ngtcp2/nghttp3/lib/nghttp3_qpack.c
@@ -41,7 +41,12 @@
 #define NGHTTP3_QPACK_MAX_QPACK_STREAMS 2000
 
 /* Make scalar initialization form of nghttp3_qpack_static_entry */
-#define MAKE_STATIC_ENT(I, T, H) {I, T, H}
+#define MAKE_STATIC_ENT(I, T, H)                                               \
+  {                                                                            \
+    .absidx = I,                                                               \
+    .token = T,                                                                \
+    .hash = H,                                                                 \
+  }
 
 /* Generated by mkstatichdtbl.py */
 static nghttp3_qpack_static_entry token_stable[] = {
@@ -166,9 +171,19 @@ static nghttp3_qpack_static_entry token_stable[] = {
 /* Make scalar initialization form of nghttp3_qpack_static_entry */
 #define MAKE_STATIC_HD(N, V, T)                                                \
   {                                                                            \
-    {NULL, (uint8_t *)(N), sizeof((N)) - 1, -1},                               \
-    {NULL, (uint8_t *)(V), sizeof((V)) - 1, -1},                               \
-    T,                                                                         \
+    .name =                                                                    \
+      {                                                                        \
+        .base = (uint8_t *)(N),                                                \
+        .len = sizeof((N)) - 1,                                                \
+        .ref = -1,                                                             \
+      },                                                                       \
+    .value =                                                                   \
+      {                                                                        \
+        .base = (uint8_t *)(V),                                                \
+        .len = sizeof((V)) - 1,                                                \
+        .ref = -1,                                                             \
+      },                                                                       \
+    .token = T,                                                                \
   }
 
 static nghttp3_qpack_static_header stable[] = {
@@ -828,29 +843,12 @@ static void encoder_qpack_map_find(nghttp3_qpack_encoder *encoder,
  * ctx->max_dtable_capacity and it is initialized to 0.
  * |hard_max_dtable_capacity| is the upper bound of
  * ctx->max_dtable_capacity.
- *
- * This function returns 0 if it succeeds, or one of the following
- * negative error codes:
- *
- * NGHTTP3_ERR_NOMEM
- *     Out of memory.
  */
-static int qpack_context_init(nghttp3_qpack_context *ctx,
-                              size_t hard_max_dtable_capacity,
-                              size_t max_blocked_streams,
-                              const nghttp3_mem *mem) {
-  int rv;
-  size_t len = 4096 / NGHTTP3_QPACK_ENTRY_OVERHEAD;
-  size_t len2;
-
-  for (len2 = 1; len2 < len; len2 <<= 1)
-    ;
-
-  rv = nghttp3_ringbuf_init(&ctx->dtable, len2, sizeof(nghttp3_qpack_entry *),
-                            mem);
-  if (rv != 0) {
-    return rv;
-  }
+static void qpack_context_init(nghttp3_qpack_context *ctx,
+                               size_t hard_max_dtable_capacity,
+                               size_t max_blocked_streams,
+                               const nghttp3_mem *mem) {
+  nghttp3_ringbuf_init(&ctx->dtable, 0, sizeof(nghttp3_qpack_entry *), mem);
 
   ctx->mem = mem;
   ctx->dtable_size = 0;
@@ -860,8 +858,6 @@ static int qpack_context_init(nghttp3_qpack_context *ctx,
   ctx->max_blocked_streams = max_blocked_streams;
   ctx->next_absidx = 0;
   ctx->bad = 0;
-
-  return 0;
 }
 
 static void qpack_context_free(nghttp3_qpack_context *ctx) {
@@ -898,19 +894,17 @@ static int max_cnt_greater(const nghttp3_ksl_key *lhs,
   return a->max_cnt > b->max_cnt || (a->max_cnt == b->max_cnt && a->id < b->id);
 }
 
-int nghttp3_qpack_encoder_init(nghttp3_qpack_encoder *encoder,
-                               size_t hard_max_dtable_capacity,
-                               const nghttp3_mem *mem) {
-  int rv;
+nghttp3_ksl_search_def(max_cnt_greater, max_cnt_greater)
 
-  rv = qpack_context_init(&encoder->ctx, hard_max_dtable_capacity, 0, mem);
-  if (rv != 0) {
-    return rv;
-  }
+void nghttp3_qpack_encoder_init(nghttp3_qpack_encoder *encoder,
+                                size_t hard_max_dtable_capacity,
+                                const nghttp3_mem *mem) {
+  qpack_context_init(&encoder->ctx, hard_max_dtable_capacity, 0, mem);
 
   nghttp3_map_init(&encoder->streams, mem);
 
   nghttp3_ksl_init(&encoder->blocked_streams, max_cnt_greater,
+                   ksl_max_cnt_greater_search,
                    sizeof(nghttp3_blocked_streams_key), mem);
 
   qpack_map_init(&encoder->dtable_map);
@@ -925,8 +919,6 @@ int nghttp3_qpack_encoder_init(nghttp3_qpack_encoder *encoder,
   encoder->flags = NGHTTP3_QPACK_ENCODER_FLAG_NONE;
 
   nghttp3_qpack_read_state_reset(&encoder->rstate);
-
-  return 0;
 }
 
 static int map_stream_free(void *data, void *ptr) {
@@ -1149,6 +1141,9 @@ int nghttp3_qpack_encoder_encode(nghttp3_qpack_encoder *encoder,
   int blocked_stream;
   nghttp3_qpack_stream *stream;
 
+  assert(stream_id >= 0);
+  assert(stream_id <= (int64_t)NGHTTP3_MAX_VARINT);
+
   if (encoder->ctx.bad) {
     return NGHTTP3_ERR_QPACK_FATAL;
   }
@@ -1444,7 +1439,14 @@ int nghttp3_qpack_encoder_encode_nv(nghttp3_qpack_encoder *encoder,
   uint32_t hash = 0;
   int32_t token;
   nghttp3_qpack_indexing_mode indexing_mode;
-  nghttp3_qpack_lookup_result sres = {-1, 0, -1}, dres = {-1, 0, -1};
+  nghttp3_qpack_lookup_result sres = {
+    .index = -1,
+    .pb_index = -1,
+  };
+  nghttp3_qpack_lookup_result dres = {
+    .index = -1,
+    .pb_index = -1,
+  };
   nghttp3_qpack_entry *new_ent = NULL;
   int static_entry;
   int just_index = 0;
@@ -1608,8 +1610,10 @@ int nghttp3_qpack_encoder_encode_nv(nghttp3_qpack_encoder *encoder,
 nghttp3_qpack_lookup_result
 nghttp3_qpack_lookup_stable(const nghttp3_nv *nv, int32_t token,
                             nghttp3_qpack_indexing_mode indexing_mode) {
-  nghttp3_qpack_lookup_result res = {(nghttp3_ssize)token_stable[token].absidx,
-                                     0, -1};
+  nghttp3_qpack_lookup_result res = {
+    .index = (nghttp3_ssize)token_stable[token].absidx,
+    .pb_index = -1,
+  };
   nghttp3_qpack_static_entry *ent;
   nghttp3_qpack_static_header *hdr;
   size_t i;
@@ -1639,7 +1643,10 @@ nghttp3_qpack_lookup_result nghttp3_qpack_encoder_lookup_dtable(
   nghttp3_qpack_encoder *encoder, const nghttp3_nv *nv, int32_t token,
   uint32_t hash, nghttp3_qpack_indexing_mode indexing_mode, uint64_t krcnt,
   int allow_blocking) {
-  nghttp3_qpack_lookup_result res = {-1, 0, -1};
+  nghttp3_qpack_lookup_result res = {
+    .index = -1,
+    .pb_index = -1,
+  };
   int exact_match = 0;
   nghttp3_qpack_entry *match, *pb_match;
 
@@ -1694,7 +1701,6 @@ static int ref_max_cnt_greater(const nghttp3_pq_entry *lhsx,
 
 int nghttp3_qpack_stream_new(nghttp3_qpack_stream **pstream, int64_t stream_id,
                              const nghttp3_mem *mem) {
-  int rv;
   nghttp3_qpack_stream *stream;
 
   stream = nghttp3_mem_malloc(mem, sizeof(nghttp3_qpack_stream));
@@ -1702,12 +1708,8 @@ int nghttp3_qpack_stream_new(nghttp3_qpack_stream **pstream, int64_t stream_id,
     return NGHTTP3_ERR_NOMEM;
   }
 
-  rv = nghttp3_ringbuf_init(&stream->refs, 4,
-                            sizeof(nghttp3_qpack_header_block_ref *), mem);
-  if (rv != 0) {
-    nghttp3_mem_free(mem, stream);
-    return rv;
-  }
+  nghttp3_ringbuf_init(&stream->refs, 0,
+                       sizeof(nghttp3_qpack_header_block_ref *), mem);
 
   nghttp3_pq_init(&stream->max_cnts, ref_max_cnt_greater, mem);
 
@@ -1759,17 +1761,23 @@ int nghttp3_qpack_stream_add_ref(nghttp3_qpack_stream *stream,
   int rv;
 
   if (nghttp3_ringbuf_full(&stream->refs)) {
-    rv = nghttp3_ringbuf_reserve(&stream->refs,
-                                 nghttp3_ringbuf_len(&stream->refs) * 2);
+    rv = nghttp3_ringbuf_reserve(
+      &stream->refs,
+      nghttp3_max_size(4, nghttp3_ringbuf_len(&stream->refs) * 2));
     if (rv != 0) {
       return rv;
     }
   }
 
+  rv = nghttp3_pq_push(&stream->max_cnts, &ref->max_cnts_pe);
+  if (rv != 0) {
+    return rv;
+  }
+
   dest = nghttp3_ringbuf_push_back(&stream->refs);
   *dest = ref;
 
-  return nghttp3_pq_push(&stream->max_cnts, &ref->max_cnts_pe);
+  return 0;
 }
 
 void nghttp3_qpack_stream_pop_ref(nghttp3_qpack_stream *stream) {
@@ -1834,7 +1842,7 @@ static int qpack_encoder_write_indexed_name(nghttp3_qpack_encoder *encoder,
   int h = 0;
 
   hlen = nghttp3_qpack_huffman_encode_count(nv->value, nv->valuelen);
-  if (hlen * 4 < nv->valuelen * 3) {
+  if (hlen < nv->valuelen) {
     h = 1;
     len += nghttp3_qpack_put_varint_len(hlen, 7) + hlen;
   } else {
@@ -1925,7 +1933,7 @@ static int qpack_encoder_write_literal(nghttp3_qpack_encoder *encoder,
   int nh = 0, vh = 0;
 
   nhlen = nghttp3_qpack_huffman_encode_count(nv->name, nv->namelen);
-  if (nhlen * 4 < nv->namelen * 3) {
+  if (nhlen < nv->namelen) {
     nh = 1;
     len = nghttp3_qpack_put_varint_len(nhlen, prefix) + nhlen;
   } else {
@@ -1933,7 +1941,7 @@ static int qpack_encoder_write_literal(nghttp3_qpack_encoder *encoder,
   }
 
   vhlen = nghttp3_qpack_huffman_encode_count(nv->value, nv->valuelen);
-  if (vhlen * 4 < nv->valuelen * 3) {
+  if (vhlen < nv->valuelen) {
     vh = 1;
     len += nghttp3_qpack_put_varint_len(vhlen, 7) + vhlen;
   } else {
@@ -2083,8 +2091,9 @@ int nghttp3_qpack_context_dtable_add(nghttp3_qpack_context *ctx,
                            hash);
 
   if (nghttp3_ringbuf_full(&ctx->dtable)) {
-    rv = nghttp3_ringbuf_reserve(&ctx->dtable,
-                                 nghttp3_ringbuf_len(&ctx->dtable) * 2);
+    rv = nghttp3_ringbuf_reserve(
+      &ctx->dtable,
+      nghttp3_max_size(128, nghttp3_ringbuf_len(&ctx->dtable) * 2));
     if (rv != 0) {
       goto fail;
     }
@@ -2259,10 +2268,11 @@ void nghttp3_qpack_entry_free(nghttp3_qpack_entry *ent) {
 int nghttp3_qpack_encoder_block_stream(nghttp3_qpack_encoder *encoder,
                                        nghttp3_qpack_stream *stream) {
   nghttp3_blocked_streams_key bsk = {
-    nghttp3_struct_of(nghttp3_pq_top(&stream->max_cnts),
-                      nghttp3_qpack_header_block_ref, max_cnts_pe)
-      ->max_cnt,
-    (uint64_t)stream->stream_id};
+    .max_cnt = nghttp3_struct_of(nghttp3_pq_top(&stream->max_cnts),
+                                 nghttp3_qpack_header_block_ref, max_cnts_pe)
+                 ->max_cnt,
+    .id = (uint64_t)stream->stream_id,
+  };
 
   return nghttp3_ksl_insert(&encoder->blocked_streams, NULL, &bsk, stream);
 }
@@ -2270,10 +2280,11 @@ int nghttp3_qpack_encoder_block_stream(nghttp3_qpack_encoder *encoder,
 void nghttp3_qpack_encoder_unblock_stream(nghttp3_qpack_encoder *encoder,
                                           nghttp3_qpack_stream *stream) {
   nghttp3_blocked_streams_key bsk = {
-    nghttp3_struct_of(nghttp3_pq_top(&stream->max_cnts),
-                      nghttp3_qpack_header_block_ref, max_cnts_pe)
-      ->max_cnt,
-    (uint64_t)stream->stream_id};
+    .max_cnt = nghttp3_struct_of(nghttp3_pq_top(&stream->max_cnts),
+                                 nghttp3_qpack_header_block_ref, max_cnts_pe)
+                 ->max_cnt,
+    .id = (uint64_t)stream->stream_id,
+  };
   nghttp3_ksl_it it;
 
   /* This is purely debugging purpose only */
@@ -2287,7 +2298,9 @@ void nghttp3_qpack_encoder_unblock_stream(nghttp3_qpack_encoder *encoder,
 
 void nghttp3_qpack_encoder_unblock(nghttp3_qpack_encoder *encoder,
                                    uint64_t max_cnt) {
-  nghttp3_blocked_streams_key bsk = {max_cnt, 0};
+  nghttp3_blocked_streams_key bsk = {
+    .max_cnt = max_cnt,
+  };
   nghttp3_ksl_it it;
 
   it = nghttp3_ksl_lower_bound(&encoder->blocked_streams, &bsk);
@@ -2667,17 +2680,12 @@ void nghttp3_qpack_read_state_reset(nghttp3_qpack_read_state *rstate) {
   rstate->huffman_encoded = 0;
 }
 
-int nghttp3_qpack_decoder_init(nghttp3_qpack_decoder *decoder,
-                               size_t hard_max_dtable_capacity,
-                               size_t max_blocked_streams,
-                               const nghttp3_mem *mem) {
-  int rv;
-
-  rv = qpack_context_init(&decoder->ctx, hard_max_dtable_capacity,
-                          max_blocked_streams, mem);
-  if (rv != 0) {
-    return rv;
-  }
+void nghttp3_qpack_decoder_init(nghttp3_qpack_decoder *decoder,
+                                size_t hard_max_dtable_capacity,
+                                size_t max_blocked_streams,
+                                const nghttp3_mem *mem) {
+  qpack_context_init(&decoder->ctx, hard_max_dtable_capacity,
+                     max_blocked_streams, mem);
 
   decoder->state = NGHTTP3_QPACK_ES_STATE_OPCODE;
   decoder->opcode = 0;
@@ -2687,8 +2695,6 @@ int nghttp3_qpack_decoder_init(nghttp3_qpack_decoder *decoder,
 
   nghttp3_qpack_read_state_reset(&decoder->rstate);
   nghttp3_buf_init(&decoder->dbuf);
-
-  return 0;
 }
 
 void nghttp3_qpack_decoder_free(nghttp3_qpack_decoder *decoder) {
@@ -3171,6 +3177,7 @@ int nghttp3_qpack_decoder_dtable_static_add(nghttp3_qpack_decoder *decoder) {
   rv = nghttp3_qpack_context_dtable_add(&decoder->ctx, &qnv, NULL, 0);
 
   nghttp3_rcbuf_decref(qnv.value);
+  decoder->rstate.value = NULL;
 
   return rv;
 }
@@ -3197,6 +3204,7 @@ int nghttp3_qpack_decoder_dtable_dynamic_add(nghttp3_qpack_decoder *decoder) {
   rv = nghttp3_qpack_context_dtable_add(&decoder->ctx, &qnv, NULL, 0);
 
   nghttp3_rcbuf_decref(qnv.value);
+  decoder->rstate.value = NULL;
   nghttp3_rcbuf_decref(qnv.name);
 
   return rv;
@@ -3250,7 +3258,9 @@ int nghttp3_qpack_decoder_dtable_literal_add(nghttp3_qpack_decoder *decoder) {
   rv = nghttp3_qpack_context_dtable_add(&decoder->ctx, &qnv, NULL, 0);
 
   nghttp3_rcbuf_decref(qnv.value);
+  decoder->rstate.value = NULL;
   nghttp3_rcbuf_decref(qnv.name);
+  decoder->rstate.name = NULL;
 
   return rv;
 }
@@ -3818,6 +3828,9 @@ int nghttp3_qpack_decoder_cancel_stream(nghttp3_qpack_decoder *decoder,
   uint8_t *p;
   int rv;
 
+  assert(stream_id >= 0);
+  assert(stream_id <= (int64_t)NGHTTP3_MAX_VARINT);
+
   if (qpack_decoder_dbuf_overflow(decoder)) {
     return NGHTTP3_ERR_QPACK_FATAL;
   }
@@ -4062,7 +4075,6 @@ void nghttp3_qpack_decoder_emit_literal(nghttp3_qpack_decoder *decoder,
 int nghttp3_qpack_encoder_new(nghttp3_qpack_encoder **pencoder,
                               size_t hard_max_dtable_capacity,
                               const nghttp3_mem *mem) {
-  int rv;
   nghttp3_qpack_encoder *p;
 
   p = nghttp3_mem_malloc(mem, sizeof(nghttp3_qpack_encoder));
@@ -4070,10 +4082,7 @@ int nghttp3_qpack_encoder_new(nghttp3_qpack_encoder **pencoder,
     return NGHTTP3_ERR_NOMEM;
   }
 
-  rv = nghttp3_qpack_encoder_init(p, hard_max_dtable_capacity, mem);
-  if (rv != 0) {
-    return rv;
-  }
+  nghttp3_qpack_encoder_init(p, hard_max_dtable_capacity, mem);
 
   *pencoder = p;
 
@@ -4098,6 +4107,9 @@ int nghttp3_qpack_stream_context_new(nghttp3_qpack_stream_context **psctx,
                                      const nghttp3_mem *mem) {
   nghttp3_qpack_stream_context *p;
 
+  assert(stream_id >= 0);
+  assert(stream_id <= (int64_t)NGHTTP3_MAX_VARINT);
+
   p = nghttp3_mem_malloc(mem, sizeof(nghttp3_qpack_stream_context));
   if (p == NULL) {
     return NGHTTP3_ERR_NOMEM;
@@ -4127,7 +4139,6 @@ int nghttp3_qpack_decoder_new(nghttp3_qpack_decoder **pdecoder,
                               size_t hard_max_dtable_capacity,
                               size_t max_blocked_streams,
                               const nghttp3_mem *mem) {
-  int rv;
   nghttp3_qpack_decoder *p;
 
   p = nghttp3_mem_malloc(mem, sizeof(nghttp3_qpack_decoder));
@@ -4135,11 +4146,8 @@ int nghttp3_qpack_decoder_new(nghttp3_qpack_decoder **pdecoder,
     return NGHTTP3_ERR_NOMEM;
   }
 
-  rv = nghttp3_qpack_decoder_init(p, hard_max_dtable_capacity,
-                                  max_blocked_streams, mem);
-  if (rv != 0) {
-    return rv;
-  }
+  nghttp3_qpack_decoder_init(p, hard_max_dtable_capacity, max_blocked_streams,
+                             mem);
 
   *pdecoder = p;
 
diff --git a/deps/ngtcp2/nghttp3/lib/nghttp3_qpack.h b/deps/ngtcp2/nghttp3/lib/nghttp3_qpack.h
index d2bb8a35811..cb82333abc4 100644
--- a/deps/ngtcp2/nghttp3/lib/nghttp3_qpack.h
+++ b/deps/ngtcp2/nghttp3/lib/nghttp3_qpack.h
@@ -270,16 +270,10 @@ struct nghttp3_qpack_encoder {
  * nghttp3_qpack_encoder_init initializes |encoder|.
  * |hard_max_dtable_capacity| is the upper bound of the dynamic table
  * capacity.  |mem| is a memory allocator.
- *
- * This function returns 0 if it succeeds, or one of the following
- * negative error codes:
- *
- * NGHTTP3_ERR_NOMEM
- *     Out of memory.
  */
-int nghttp3_qpack_encoder_init(nghttp3_qpack_encoder *encoder,
-                               size_t hard_max_dtable_capacity,
-                               const nghttp3_mem *mem);
+void nghttp3_qpack_encoder_init(nghttp3_qpack_encoder *encoder,
+                                size_t hard_max_dtable_capacity,
+                                const nghttp3_mem *mem);
 
 /*
  * nghttp3_qpack_encoder_free frees memory allocated for |encoder|.
@@ -800,17 +794,11 @@ struct nghttp3_qpack_decoder {
  * |hard_max_dtable_capacity| is the upper bound of the dynamic table
  * capacity.  |max_blocked_streams| is the maximum number of stream
  * which can be blocked.  |mem| is a memory allocator.
- *
- * This function returns 0 if it succeeds, or one of the following
- * negative error codes:
- *
- * NGHTTP3_ERR_NOMEM
- *     Out of memory.
  */
-int nghttp3_qpack_decoder_init(nghttp3_qpack_decoder *decoder,
-                               size_t hard_max_dtable_capacity,
-                               size_t max_blocked_streams,
-                               const nghttp3_mem *mem);
+void nghttp3_qpack_decoder_init(nghttp3_qpack_decoder *decoder,
+                                size_t hard_max_dtable_capacity,
+                                size_t max_blocked_streams,
+                                const nghttp3_mem *mem);
 
 /*
  * nghttp3_qpack_decoder_free frees memory allocated for |decoder|.
diff --git a/deps/ngtcp2/nghttp3/lib/nghttp3_qpack_huffman.c b/deps/ngtcp2/nghttp3/lib/nghttp3_qpack_huffman.c
index 3398f3f5080..dbc9a764e7b 100644
--- a/deps/ngtcp2/nghttp3/lib/nghttp3_qpack_huffman.c
+++ b/deps/ngtcp2/nghttp3/lib/nghttp3_qpack_huffman.c
@@ -88,7 +88,9 @@ nghttp3_qpack_huffman_decode(nghttp3_qpack_huffman_decode_context *ctx,
                              int fin) {
   uint8_t *p = dest;
   const uint8_t *end = src + srclen;
-  nghttp3_qpack_huffman_decode_node node = {ctx->fstate, 0};
+  nghttp3_qpack_huffman_decode_node node = {
+    .fstate = ctx->fstate,
+  };
   const nghttp3_qpack_huffman_decode_node *t = &node;
   uint8_t c;
 
diff --git a/deps/ngtcp2/nghttp3/lib/nghttp3_range.c b/deps/ngtcp2/nghttp3/lib/nghttp3_range.c
index af810a2c592..b5f95bb83fc 100644
--- a/deps/ngtcp2/nghttp3/lib/nghttp3_range.c
+++ b/deps/ngtcp2/nghttp3/lib/nghttp3_range.c
@@ -33,7 +33,7 @@ void nghttp3_range_init(nghttp3_range *r, uint64_t begin, uint64_t end) {
 
 nghttp3_range nghttp3_range_intersect(const nghttp3_range *a,
                                       const nghttp3_range *b) {
-  nghttp3_range r = {0, 0};
+  nghttp3_range r = {0};
   uint64_t begin = nghttp3_max_uint64(a->begin, b->begin);
   uint64_t end = nghttp3_min_uint64(a->end, b->end);
 
diff --git a/deps/ngtcp2/nghttp3/lib/nghttp3_ringbuf.c b/deps/ngtcp2/nghttp3/lib/nghttp3_ringbuf.c
index 7d3ab39bf82..ccd1d3e99ab 100644
--- a/deps/ngtcp2/nghttp3/lib/nghttp3_ringbuf.c
+++ b/deps/ngtcp2/nghttp3/lib/nghttp3_ringbuf.c
@@ -33,18 +33,21 @@
 
 #include "nghttp3_macro.h"
 
+#ifndef NDEBUG
 static int ispow2(size_t n) {
-#if defined(_MSC_VER) && !defined(__clang__) &&                                \
-  (defined(_M_ARM) || (defined(_M_ARM64) && _MSC_VER < 1941))
+#  if defined(DISABLE_POPCNT) ||                                               \
+    (defined(_MSC_VER) && !defined(__clang__) &&                               \
+     (defined(_M_ARM) || (defined(_M_ARM64) && _MSC_VER < 1941)))
   return n && !(n & (n - 1));
-#elif defined(WIN32)
+#  elif defined(WIN32)
   return 1 == __popcnt((unsigned int)n);
-#else  /* !((defined(_MSC_VER) && !defined(__clang__) && (defined(_M_ARM) ||   \
-          (defined(_M_ARM64) && _MSC_VER < 1941))) || defined(WIN32)) */
+#  else  /* !((defined(_MSC_VER) && !defined(__clang__) && (defined(_M_ARM) || \
+            (defined(_M_ARM64) && _MSC_VER < 1941))) || defined(WIN32)) */
   return 1 == __builtin_popcount((unsigned int)n);
-#endif /* !((defined(_MSC_VER) && !defined(__clang__) && (defined(_M_ARM) ||   \
-          (defined(_M_ARM64) && _MSC_VER < 1941))) || defined(WIN32)) */
+#  endif /* !((defined(_MSC_VER) && !defined(__clang__) && (defined(_M_ARM) || \
+            (defined(_M_ARM64) && _MSC_VER < 1941))) || defined(WIN32)) */
 }
+#endif /* !defined(NDEBUG) */
 
 int nghttp3_ringbuf_init(nghttp3_ringbuf *rb, size_t nmemb, size_t size,
                          const nghttp3_mem *mem) {
diff --git a/deps/ngtcp2/nghttp3/lib/nghttp3_stream.c b/deps/ngtcp2/nghttp3/lib/nghttp3_stream.c
index 328cddd488f..9ae9d4850d0 100644
--- a/deps/ngtcp2/nghttp3/lib/nghttp3_stream.c
+++ b/deps/ngtcp2/nghttp3/lib/nghttp3_stream.c
@@ -44,7 +44,7 @@
 /* NGHTTP3_MIN_RBLEN is the minimum length of nghttp3_ringbuf */
 #define NGHTTP3_MIN_RBLEN 4
 
-nghttp3_objalloc_def(stream, nghttp3_stream, oplent);
+nghttp3_objalloc_def(stream, nghttp3_stream, oplent)
 
 int nghttp3_stream_new(nghttp3_stream **pstream, int64_t stream_id,
                        const nghttp3_stream_callbacks *callbacks,
@@ -181,42 +181,45 @@ void nghttp3_stream_read_state_reset(nghttp3_stream_read_state *rstate) {
 nghttp3_ssize nghttp3_read_varint(nghttp3_varint_read_state *rvint,
                                   const uint8_t *begin, const uint8_t *end,
                                   int fin) {
-  const uint8_t *orig_begin = begin;
-  size_t len;
+  size_t len, vlen;
+  uint8_t *p;
 
   assert(begin != end);
 
   if (rvint->left == 0) {
     assert(rvint->acc == 0);
 
-    len = nghttp3_get_varintlen(begin);
-    if (len <= (size_t)(end - begin)) {
+    vlen = nghttp3_get_varintlen(begin);
+    len = nghttp3_min_size(vlen, (size_t)(end - begin));
+    if (vlen <= len) {
       nghttp3_get_varint(&rvint->acc, begin);
-      return (nghttp3_ssize)len;
+      return (nghttp3_ssize)vlen;
     }
 
     if (fin) {
       return NGHTTP3_ERR_INVALID_ARGUMENT;
     }
 
-    rvint->acc = nghttp3_get_varint_fb(begin++);
-    rvint->left = len - 1;
+    p = (uint8_t *)&rvint->acc + (sizeof(rvint->acc) - vlen);
+    memcpy(p, begin, len);
+    *p &= 0x3f;
+    rvint->left = vlen - len;
+
+    return (nghttp3_ssize)len;
   }
 
   len = nghttp3_min_size(rvint->left, (size_t)(end - begin));
-  end = begin + len;
-
-  for (; begin != end;) {
-    rvint->acc = (rvint->acc << 8) + *begin++;
-  }
-
+  p = (uint8_t *)&rvint->acc + (sizeof(rvint->acc) - rvint->left);
+  memcpy(p, begin, len);
   rvint->left -= len;
 
-  if (fin && rvint->left) {
+  if (rvint->left == 0) {
+    rvint->acc = (int64_t)nghttp3_ntohl64((uint64_t)rvint->acc);
+  } else if (fin) {
     return NGHTTP3_ERR_INVALID_ARGUMENT;
   }
 
-  return (nghttp3_ssize)(begin - orig_begin);
+  return (nghttp3_ssize)len;
 }
 
 int nghttp3_stream_frq_add(nghttp3_stream *stream,
@@ -301,12 +304,6 @@ int nghttp3_stream_fill_outq(nghttp3_stream *stream) {
   return 0;
 }
 
-static void typed_buf_shared_init(nghttp3_typed_buf *tbuf,
-                                  const nghttp3_buf *chunk) {
-  nghttp3_typed_buf_init(tbuf, chunk, NGHTTP3_BUF_TYPE_SHARED);
-  tbuf->buf.pos = tbuf->buf.last;
-}
-
 int nghttp3_stream_write_stream_type(nghttp3_stream *stream) {
   size_t len = nghttp3_put_varintlen((int64_t)stream->type);
   nghttp3_buf *chunk;
@@ -319,7 +316,7 @@ int nghttp3_stream_write_stream_type(nghttp3_stream *stream) {
   }
 
   chunk = nghttp3_stream_get_chunk(stream);
-  typed_buf_shared_init(&tbuf, chunk);
+  nghttp3_typed_buf_shared_init(&tbuf, chunk);
 
   chunk->last = nghttp3_put_varint(chunk->last, (int64_t)stream->type);
   tbuf.buf.last = chunk->last;
@@ -336,12 +333,19 @@ int nghttp3_stream_write_settings(nghttp3_stream *stream,
   struct {
     nghttp3_frame_settings settings;
     nghttp3_settings_entry iv[15];
-  } fr;
+  } fr = {
+    .settings =
+      {
+        .hd =
+          {
+            .type = NGHTTP3_FRAME_SETTINGS,
+          },
+        .niv = 3,
+      },
+  };
   nghttp3_settings_entry *iv;
   nghttp3_settings *local_settings = frent->aux.settings.local_settings;
 
-  fr.settings.hd.type = NGHTTP3_FRAME_SETTINGS;
-  fr.settings.niv = 3;
   iv = &fr.settings.iv[0];
 
   iv[0].id = NGHTTP3_SETTINGS_ID_MAX_FIELD_SECTION_SIZE;
@@ -373,7 +377,7 @@ int nghttp3_stream_write_settings(nghttp3_stream *stream,
   }
 
   chunk = nghttp3_stream_get_chunk(stream);
-  typed_buf_shared_init(&tbuf, chunk);
+  nghttp3_typed_buf_shared_init(&tbuf, chunk);
 
   chunk->last = nghttp3_frame_write_settings(chunk->last, &fr.settings);
 
@@ -398,7 +402,7 @@ int nghttp3_stream_write_goaway(nghttp3_stream *stream,
   }
 
   chunk = nghttp3_stream_get_chunk(stream);
-  typed_buf_shared_init(&tbuf, chunk);
+  nghttp3_typed_buf_shared_init(&tbuf, chunk);
 
   chunk->last = nghttp3_frame_write_goaway(chunk->last, fr);
 
@@ -423,7 +427,7 @@ int nghttp3_stream_write_priority_update(nghttp3_stream *stream,
   }
 
   chunk = nghttp3_stream_get_chunk(stream);
-  typed_buf_shared_init(&tbuf, chunk);
+  nghttp3_typed_buf_shared_init(&tbuf, chunk);
 
   chunk->last = nghttp3_frame_write_priority_update(chunk->last, fr);
 
@@ -464,7 +468,7 @@ int nghttp3_stream_write_header_block(nghttp3_stream *stream,
   rv = nghttp3_qpack_encoder_encode(qenc, &pbuf, rbuf, ebuf, stream->node.id,
                                     nva, nvlen);
   if (rv != 0) {
-    goto fail;
+    return rv;
   }
 
   pbuflen = nghttp3_buf_len(&pbuf);
@@ -482,11 +486,11 @@ int nghttp3_stream_write_header_block(nghttp3_stream *stream,
 
   rv = nghttp3_stream_ensure_chunk(stream, len);
   if (rv != 0) {
-    goto fail;
+    return rv;
   }
 
   chunk = nghttp3_stream_get_chunk(stream);
-  typed_buf_shared_init(&tbuf, chunk);
+  nghttp3_typed_buf_shared_init(&tbuf, chunk);
 
   chunk->last = nghttp3_frame_write_hd(chunk->last, &hd);
 
@@ -498,13 +502,13 @@ int nghttp3_stream_write_header_block(nghttp3_stream *stream,
 
     rv = nghttp3_stream_outq_add(stream, &tbuf);
     if (rv != 0) {
-      goto fail;
+      return rv;
     }
 
     nghttp3_typed_buf_init(&tbuf, rbuf, NGHTTP3_BUF_TYPE_PRIVATE);
     rv = nghttp3_stream_outq_add(stream, &tbuf);
     if (rv != 0) {
-      goto fail;
+      return rv;
     }
     nghttp3_buf_init(rbuf);
   } else if (rbuflen) {
@@ -513,7 +517,7 @@ int nghttp3_stream_write_header_block(nghttp3_stream *stream,
 
     rv = nghttp3_stream_outq_add(stream, &tbuf);
     if (rv != 0) {
-      goto fail;
+      return rv;
     }
     nghttp3_buf_reset(rbuf);
   }
@@ -532,18 +536,18 @@ int nghttp3_stream_write_header_block(nghttp3_stream *stream,
 
     rv = nghttp3_stream_ensure_chunk(qenc_stream, ebuflen);
     if (rv != 0) {
-      goto fail;
+      return rv;
     }
 
     chunk = nghttp3_stream_get_chunk(qenc_stream);
-    typed_buf_shared_init(&tbuf, chunk);
+    nghttp3_typed_buf_shared_init(&tbuf, chunk);
 
     chunk->last = nghttp3_cpymem(chunk->last, ebuf->pos, ebuflen);
     tbuf.buf.last = chunk->last;
 
     rv = nghttp3_stream_outq_add(qenc_stream, &tbuf);
     if (rv != 0) {
-      goto fail;
+      return rv;
     }
     nghttp3_buf_reset(ebuf);
   }
@@ -553,10 +557,6 @@ int nghttp3_stream_write_header_block(nghttp3_stream *stream,
   assert(0 == nghttp3_buf_len(ebuf));
 
   return 0;
-
-fail:
-
-  return rv;
 }
 
 int nghttp3_stream_write_data(nghttp3_stream *stream, int *peof,
@@ -635,7 +635,7 @@ int nghttp3_stream_write_data(nghttp3_stream *stream, int *peof,
   }
 
   chunk = nghttp3_stream_get_chunk(stream);
-  typed_buf_shared_init(&tbuf, chunk);
+  nghttp3_typed_buf_shared_init(&tbuf, chunk);
 
   chunk->last = nghttp3_frame_write_hd(chunk->last, &hd);
 
@@ -690,7 +690,7 @@ int nghttp3_stream_write_qpack_decoder_stream(nghttp3_stream *stream) {
   }
 
   chunk = nghttp3_stream_get_chunk(stream);
-  typed_buf_shared_init(&tbuf, chunk);
+  nghttp3_typed_buf_shared_init(&tbuf, chunk);
 
   nghttp3_qpack_decoder_write_decoder(qdec, chunk);
 
@@ -717,17 +717,16 @@ int nghttp3_stream_outq_add(nghttp3_stream *stream,
   if (len) {
     dest = nghttp3_ringbuf_get(outq, len - 1);
     if (dest->type == tbuf->type && dest->type == NGHTTP3_BUF_TYPE_SHARED &&
-        dest->buf.begin == tbuf->buf.begin && dest->buf.last == tbuf->buf.pos) {
+        dest->buf.end == tbuf->buf.end && dest->buf.last == tbuf->buf.pos) {
       /* If we have already written last entry, adjust outq_idx and
          offset so that this entry is eligible to send. */
       if (len == stream->outq_idx) {
         --stream->outq_idx;
-        stream->outq_offset = nghttp3_buf_len(&dest->buf);
       }
 
       dest->buf.last = tbuf->buf.last;
-      /* TODO Is this required? */
-      dest->buf.end = tbuf->buf.end;
+
+      assert(dest->buf.end == tbuf->buf.end);
 
       return 0;
     }
@@ -817,34 +816,24 @@ size_t nghttp3_stream_writev(nghttp3_stream *stream, int *pfin,
   nghttp3_ringbuf *outq = &stream->outq;
   size_t len = nghttp3_ringbuf_len(outq);
   size_t i = stream->outq_idx;
-  uint64_t offset = stream->outq_offset;
   size_t buflen;
   nghttp3_vec *vbegin = vec, *vend = vec + veccnt;
   nghttp3_typed_buf *tbuf;
 
   assert(veccnt > 0);
 
-  if (i < len) {
+  for (; i < len && vec != vend; ++i) {
     tbuf = nghttp3_ringbuf_get(outq, i);
     buflen = nghttp3_buf_len(&tbuf->buf);
 
-    if (offset < buflen) {
-      vec->base = tbuf->buf.pos + offset;
-      vec->len = (size_t)(buflen - offset);
-      ++vec;
-    } else {
-      /* This is the only case that satisfies offset >= buflen */
-      assert(0 == offset);
-      assert(0 == buflen);
+    if (buflen == 0) {
+      continue;
     }
 
-    ++i;
+    vec->base = tbuf->buf.pos;
+    vec->len = buflen;
 
-    for (; i < len && vec != vend; ++i, ++vec) {
-      tbuf = nghttp3_ringbuf_get(outq, i);
-      vec->base = tbuf->buf.pos;
-      vec->len = nghttp3_buf_len(&tbuf->buf);
-    }
+    ++vec;
   }
 
   /* TODO Rework this if we have finished implementing HTTP
@@ -859,26 +848,27 @@ void nghttp3_stream_add_outq_offset(nghttp3_stream *stream, size_t n) {
   nghttp3_ringbuf *outq = &stream->outq;
   size_t i;
   size_t len = nghttp3_ringbuf_len(outq);
-  uint64_t offset = stream->outq_offset + n;
   size_t buflen;
   nghttp3_typed_buf *tbuf;
 
+  stream->unsent_bytes -= n;
+
   for (i = stream->outq_idx; i < len; ++i) {
     tbuf = nghttp3_ringbuf_get(outq, i);
     buflen = nghttp3_buf_len(&tbuf->buf);
-    if (offset >= buflen) {
-      offset -= buflen;
-      continue;
+    if (n < buflen) {
+      tbuf->buf.pos += n;
+
+      break;
     }
 
-    break;
+    tbuf->buf.pos = tbuf->buf.last;
+    n -= buflen;
   }
 
-  assert(i < len || offset == 0);
+  assert(i < len || n == 0);
 
-  stream->unsent_bytes -= n;
   stream->outq_idx = i;
-  stream->outq_offset = offset;
 }
 
 int nghttp3_stream_outq_write_done(nghttp3_stream *stream) {
@@ -904,7 +894,6 @@ static void stream_pop_outq_entry(nghttp3_stream *stream,
 
     chunk = nghttp3_ringbuf_get(chunks, 0);
 
-    assert(chunk->begin == tbuf->buf.begin);
     assert(chunk->end == tbuf->buf.end);
 
     if (chunk->last == tbuf->buf.last) {
@@ -927,14 +916,13 @@ static void stream_pop_outq_entry(nghttp3_stream *stream,
 int nghttp3_stream_update_ack_offset(nghttp3_stream *stream, uint64_t offset) {
   nghttp3_ringbuf *outq = &stream->outq;
   size_t buflen;
-  size_t npopped = 0;
   uint64_t nack;
   nghttp3_typed_buf *tbuf;
   int rv;
 
   for (; nghttp3_ringbuf_len(outq);) {
     tbuf = nghttp3_ringbuf_get(outq, 0);
-    buflen = nghttp3_buf_len(&tbuf->buf);
+    buflen = (size_t)(tbuf->buf.last - tbuf->buf.begin);
 
     /* For NGHTTP3_BUF_TYPE_ALIEN, we never add 0 length buffer. */
     if (tbuf->type == NGHTTP3_BUF_TYPE_ALIEN && stream->ack_offset < offset &&
@@ -949,17 +937,13 @@ int nghttp3_stream_update_ack_offset(nghttp3_stream *stream, uint64_t offset) {
       }
     }
 
-    if (offset >= stream->ack_base + buflen) {
+    if (stream->outq_idx > 0 && offset >= stream->ack_base + buflen) {
       stream_pop_outq_entry(stream, tbuf);
 
       stream->ack_base += buflen;
       stream->ack_offset = stream->ack_base;
-      ++npopped;
 
-      if (stream->outq_idx + 1 == npopped) {
-        stream->outq_offset = 0;
-        break;
-      }
+      --stream->outq_idx;
 
       continue;
     }
@@ -967,13 +951,6 @@ int nghttp3_stream_update_ack_offset(nghttp3_stream *stream, uint64_t offset) {
     break;
   }
 
-  assert(stream->outq_idx + 1 >= npopped);
-  if (stream->outq_idx >= npopped) {
-    stream->outq_idx -= npopped;
-  } else {
-    stream->outq_idx = 0;
-  }
-
   stream->ack_offset = offset;
 
   return 0;
@@ -1045,19 +1022,17 @@ int nghttp3_stream_transit_rx_http_state(nghttp3_stream *stream,
 
   switch (stream->rx.hstate) {
   case NGHTTP3_HTTP_STATE_NONE:
-    return NGHTTP3_ERR_H3_INTERNAL_ERROR;
+    nghttp3_unreachable();
   case NGHTTP3_HTTP_STATE_REQ_INITIAL:
-    switch (event) {
-    case NGHTTP3_HTTP_EVENT_HEADERS_BEGIN:
-      stream->rx.hstate = NGHTTP3_HTTP_STATE_REQ_HEADERS_BEGIN;
-      return 0;
-    default:
+    if (event != NGHTTP3_HTTP_EVENT_HEADERS_BEGIN) {
       return NGHTTP3_ERR_H3_FRAME_UNEXPECTED;
     }
+
+    stream->rx.hstate = NGHTTP3_HTTP_STATE_REQ_HEADERS_BEGIN;
+
+    return 0;
   case NGHTTP3_HTTP_STATE_REQ_HEADERS_BEGIN:
-    if (event != NGHTTP3_HTTP_EVENT_HEADERS_END) {
-      return NGHTTP3_ERR_MALFORMED_HTTP_MESSAGING;
-    }
+    assert(NGHTTP3_HTTP_EVENT_HEADERS_END == event);
     stream->rx.hstate = NGHTTP3_HTTP_STATE_REQ_HEADERS_END;
     return 0;
   case NGHTTP3_HTTP_STATE_REQ_HEADERS_END:
@@ -1080,12 +1055,10 @@ int nghttp3_stream_transit_rx_http_state(nghttp3_stream *stream,
       stream->rx.hstate = NGHTTP3_HTTP_STATE_REQ_END;
       return 0;
     default:
-      return NGHTTP3_ERR_H3_FRAME_UNEXPECTED;
+      nghttp3_unreachable();
     }
   case NGHTTP3_HTTP_STATE_REQ_DATA_BEGIN:
-    if (event != NGHTTP3_HTTP_EVENT_DATA_END) {
-      return NGHTTP3_ERR_MALFORMED_HTTP_MESSAGING;
-    }
+    assert(NGHTTP3_HTTP_EVENT_DATA_END == event);
     stream->rx.hstate = NGHTTP3_HTTP_STATE_REQ_DATA_END;
     return 0;
   case NGHTTP3_HTTP_STATE_REQ_DATA_END:
@@ -1108,12 +1081,10 @@ int nghttp3_stream_transit_rx_http_state(nghttp3_stream *stream,
       stream->rx.hstate = NGHTTP3_HTTP_STATE_REQ_END;
       return 0;
     default:
-      return NGHTTP3_ERR_H3_FRAME_UNEXPECTED;
+      nghttp3_unreachable();
     }
   case NGHTTP3_HTTP_STATE_REQ_TRAILERS_BEGIN:
-    if (event != NGHTTP3_HTTP_EVENT_HEADERS_END) {
-      return NGHTTP3_ERR_MALFORMED_HTTP_MESSAGING;
-    }
+    assert(NGHTTP3_HTTP_EVENT_HEADERS_END == event);
     stream->rx.hstate = NGHTTP3_HTTP_STATE_REQ_TRAILERS_END;
     return 0;
   case NGHTTP3_HTTP_STATE_REQ_TRAILERS_END:
@@ -1129,7 +1100,7 @@ int nghttp3_stream_transit_rx_http_state(nghttp3_stream *stream,
     stream->rx.hstate = NGHTTP3_HTTP_STATE_REQ_END;
     return 0;
   case NGHTTP3_HTTP_STATE_REQ_END:
-    return NGHTTP3_ERR_MALFORMED_HTTP_MESSAGING;
+    return NGHTTP3_ERR_H3_FRAME_UNEXPECTED;
   case NGHTTP3_HTTP_STATE_RESP_INITIAL:
     if (event != NGHTTP3_HTTP_EVENT_HEADERS_BEGIN) {
       return NGHTTP3_ERR_H3_FRAME_UNEXPECTED;
@@ -1137,9 +1108,7 @@ int nghttp3_stream_transit_rx_http_state(nghttp3_stream *stream,
     stream->rx.hstate = NGHTTP3_HTTP_STATE_RESP_HEADERS_BEGIN;
     return 0;
   case NGHTTP3_HTTP_STATE_RESP_HEADERS_BEGIN:
-    if (event != NGHTTP3_HTTP_EVENT_HEADERS_END) {
-      return NGHTTP3_ERR_MALFORMED_HTTP_MESSAGING;
-    }
+    assert(NGHTTP3_HTTP_EVENT_HEADERS_END == event);
     stream->rx.hstate = NGHTTP3_HTTP_STATE_RESP_HEADERS_END;
     return 0;
   case NGHTTP3_HTTP_STATE_RESP_HEADERS_END:
@@ -1169,12 +1138,10 @@ int nghttp3_stream_transit_rx_http_state(nghttp3_stream *stream,
       stream->rx.hstate = NGHTTP3_HTTP_STATE_RESP_END;
       return 0;
     default:
-      return NGHTTP3_ERR_H3_FRAME_UNEXPECTED;
+      nghttp3_unreachable();
     }
   case NGHTTP3_HTTP_STATE_RESP_DATA_BEGIN:
-    if (event != NGHTTP3_HTTP_EVENT_DATA_END) {
-      return NGHTTP3_ERR_MALFORMED_HTTP_MESSAGING;
-    }
+    assert(NGHTTP3_HTTP_EVENT_DATA_END == event);
     stream->rx.hstate = NGHTTP3_HTTP_STATE_RESP_DATA_END;
     return 0;
   case NGHTTP3_HTTP_STATE_RESP_DATA_END:
@@ -1197,17 +1164,15 @@ int nghttp3_stream_transit_rx_http_state(nghttp3_stream *stream,
       stream->rx.hstate = NGHTTP3_HTTP_STATE_RESP_END;
       return 0;
     default:
-      return NGHTTP3_ERR_H3_FRAME_UNEXPECTED;
+      nghttp3_unreachable();
     }
   case NGHTTP3_HTTP_STATE_RESP_TRAILERS_BEGIN:
-    if (event != NGHTTP3_HTTP_EVENT_HEADERS_END) {
-      return NGHTTP3_ERR_MALFORMED_HTTP_MESSAGING;
-    }
+    assert(NGHTTP3_HTTP_EVENT_HEADERS_END == event);
     stream->rx.hstate = NGHTTP3_HTTP_STATE_RESP_TRAILERS_END;
     return 0;
   case NGHTTP3_HTTP_STATE_RESP_TRAILERS_END:
     if (event != NGHTTP3_HTTP_EVENT_MSG_END) {
-      return NGHTTP3_ERR_MALFORMED_HTTP_MESSAGING;
+      return NGHTTP3_ERR_H3_FRAME_UNEXPECTED;
     }
     rv = nghttp3_http_on_remote_end_stream(stream);
     if (rv != 0) {
@@ -1216,7 +1181,7 @@ int nghttp3_stream_transit_rx_http_state(nghttp3_stream *stream,
     stream->rx.hstate = NGHTTP3_HTTP_STATE_RESP_END;
     return 0;
   case NGHTTP3_HTTP_STATE_RESP_END:
-    return NGHTTP3_ERR_MALFORMED_HTTP_MESSAGING;
+    return NGHTTP3_ERR_H3_FRAME_UNEXPECTED;
   default:
     nghttp3_unreachable();
   }
diff --git a/deps/ngtcp2/nghttp3/lib/nghttp3_stream.h b/deps/ngtcp2/nghttp3/lib/nghttp3_stream.h
index 7d296febf91..d24cae04470 100644
--- a/deps/ngtcp2/nghttp3/lib/nghttp3_stream.h
+++ b/deps/ngtcp2/nghttp3/lib/nghttp3_stream.h
@@ -223,9 +223,6 @@ struct nghttp3_stream {
       uint64_t unsent_bytes;
       /* outq_idx is an index into outq where next write is made. */
       size_t outq_idx;
-      /* outq_offset is write offset relative to the element at outq_idx
-         in outq. */
-      uint64_t outq_offset;
       /* ack_base is the number of bytes acknowledged by a remote
          endpoint where the first element in outq is positioned at. */
       uint64_t ack_base;
@@ -255,7 +252,7 @@ struct nghttp3_stream {
   };
 };
 
-nghttp3_objalloc_decl(stream, nghttp3_stream, oplent);
+nghttp3_objalloc_decl(stream, nghttp3_stream, oplent)
 
 typedef struct nghttp3_frame_entry {
   nghttp3_frame fr;
diff --git a/deps/ngtcp2/nghttp3/lib/nghttp3_version.c b/deps/ngtcp2/nghttp3/lib/nghttp3_version.c
index 939821d84ea..b88e2255b25 100644
--- a/deps/ngtcp2/nghttp3/lib/nghttp3_version.c
+++ b/deps/ngtcp2/nghttp3/lib/nghttp3_version.c
@@ -28,8 +28,11 @@
 
 #include <nghttp3/nghttp3.h>
 
-static nghttp3_info version = {NGHTTP3_VERSION_AGE, NGHTTP3_VERSION_NUM,
-                               NGHTTP3_VERSION};
+static nghttp3_info version = {
+  .age = NGHTTP3_VERSION_AGE,
+  .version_num = NGHTTP3_VERSION_NUM,
+  .version_str = NGHTTP3_VERSION,
+};
 
 const nghttp3_info *nghttp3_version(int least_version) {
   if (least_version > NGHTTP3_VERSION_NUM) {
diff --git a/deps/ngtcp2/nghttp3/lib/sfparse/sfparse.c b/deps/ngtcp2/nghttp3/lib/sfparse/sfparse.c
index d0328cf40c2..cee089d3944 100644
--- a/deps/ngtcp2/nghttp3/lib/sfparse/sfparse.c
+++ b/deps/ngtcp2/nghttp3/lib/sfparse/sfparse.c
@@ -30,38 +30,46 @@
 #include <assert.h>
 #include <stdlib.h>
 
-#define SF_STATE_DICT 0x08u
-#define SF_STATE_LIST 0x10u
-#define SF_STATE_ITEM 0x18u
+#ifdef __AVX2__
+#  include <immintrin.h>
+#endif /* __AVX2__ */
 
-#define SF_STATE_INNER_LIST 0x04u
+#define SFPARSE_STATE_DICT 0x08u
+#define SFPARSE_STATE_LIST 0x10u
+#define SFPARSE_STATE_ITEM 0x18u
 
-#define SF_STATE_BEFORE 0x00u
-#define SF_STATE_BEFORE_PARAMS 0x01u
-#define SF_STATE_PARAMS 0x02u
-#define SF_STATE_AFTER 0x03u
+#define SFPARSE_STATE_INNER_LIST 0x04u
 
-#define SF_STATE_OP_MASK 0x03u
+#define SFPARSE_STATE_BEFORE 0x00u
+#define SFPARSE_STATE_BEFORE_PARAMS 0x01u
+#define SFPARSE_STATE_PARAMS 0x02u
+#define SFPARSE_STATE_AFTER 0x03u
 
-#define SF_SET_STATE_AFTER(NAME) (SF_STATE_##NAME | SF_STATE_AFTER)
-#define SF_SET_STATE_BEFORE_PARAMS(NAME)                                       \
-  (SF_STATE_##NAME | SF_STATE_BEFORE_PARAMS)
-#define SF_SET_STATE_INNER_LIST_BEFORE(NAME)                                   \
-  (SF_STATE_##NAME | SF_STATE_INNER_LIST | SF_STATE_BEFORE)
+#define SFPARSE_STATE_OP_MASK 0x03u
 
-#define SF_STATE_DICT_AFTER SF_SET_STATE_AFTER(DICT)
-#define SF_STATE_DICT_BEFORE_PARAMS SF_SET_STATE_BEFORE_PARAMS(DICT)
-#define SF_STATE_DICT_INNER_LIST_BEFORE SF_SET_STATE_INNER_LIST_BEFORE(DICT)
+#define SFPARSE_SET_STATE_AFTER(NAME)                                          \
+  (SFPARSE_STATE_##NAME | SFPARSE_STATE_AFTER)
+#define SFPARSE_SET_STATE_BEFORE_PARAMS(NAME)                                  \
+  (SFPARSE_STATE_##NAME | SFPARSE_STATE_BEFORE_PARAMS)
+#define SFPARSE_SET_STATE_INNER_LIST_BEFORE(NAME)                              \
+  (SFPARSE_STATE_##NAME | SFPARSE_STATE_INNER_LIST | SFPARSE_STATE_BEFORE)
 
-#define SF_STATE_LIST_AFTER SF_SET_STATE_AFTER(LIST)
-#define SF_STATE_LIST_BEFORE_PARAMS SF_SET_STATE_BEFORE_PARAMS(LIST)
-#define SF_STATE_LIST_INNER_LIST_BEFORE SF_SET_STATE_INNER_LIST_BEFORE(LIST)
+#define SFPARSE_STATE_DICT_AFTER SFPARSE_SET_STATE_AFTER(DICT)
+#define SFPARSE_STATE_DICT_BEFORE_PARAMS SFPARSE_SET_STATE_BEFORE_PARAMS(DICT)
+#define SFPARSE_STATE_DICT_INNER_LIST_BEFORE                                   \
+  SFPARSE_SET_STATE_INNER_LIST_BEFORE(DICT)
 
-#define SF_STATE_ITEM_AFTER SF_SET_STATE_AFTER(ITEM)
-#define SF_STATE_ITEM_BEFORE_PARAMS SF_SET_STATE_BEFORE_PARAMS(ITEM)
-#define SF_STATE_ITEM_INNER_LIST_BEFORE SF_SET_STATE_INNER_LIST_BEFORE(ITEM)
+#define SFPARSE_STATE_LIST_AFTER SFPARSE_SET_STATE_AFTER(LIST)
+#define SFPARSE_STATE_LIST_BEFORE_PARAMS SFPARSE_SET_STATE_BEFORE_PARAMS(LIST)
+#define SFPARSE_STATE_LIST_INNER_LIST_BEFORE                                   \
+  SFPARSE_SET_STATE_INNER_LIST_BEFORE(LIST)
 
-#define SF_STATE_INITIAL 0x00u
+#define SFPARSE_STATE_ITEM_AFTER SFPARSE_SET_STATE_AFTER(ITEM)
+#define SFPARSE_STATE_ITEM_BEFORE_PARAMS SFPARSE_SET_STATE_BEFORE_PARAMS(ITEM)
+#define SFPARSE_STATE_ITEM_INNER_LIST_BEFORE                                   \
+  SFPARSE_SET_STATE_INNER_LIST_BEFORE(ITEM)
+
+#define SFPARSE_STATE_INITIAL 0x00u
 
 #define DIGIT_CASES                                                            \
   case '0':                                                                    \
@@ -380,40 +388,108 @@ static int is_ws(uint8_t c) {
   }
 }
 
-static int parser_eof(sf_parser *sfp) { return sfp->pos == sfp->end; }
+#ifdef __AVX2__
+#  ifdef _MSC_VER
+#    include <intrin.h>
 
-static void parser_discard_ows(sf_parser *sfp) {
+static int ctz(unsigned int v) {
+  unsigned long n;
+
+  /* Assume that v is not 0. */
+  _BitScanForward(&n, v);
+
+  return (int)n;
+}
+#  else /* !_MSC_VER */
+#    define ctz __builtin_ctz
+#  endif /* !_MSC_VER */
+#endif   /* __AVX2__ */
+
+static int parser_eof(sfparse_parser *sfp) { return sfp->pos == sfp->end; }
+
+static void parser_discard_ows(sfparse_parser *sfp) {
   for (; !parser_eof(sfp) && is_ws(*sfp->pos); ++sfp->pos)
     ;
 }
 
-static void parser_discard_sp(sf_parser *sfp) {
+static void parser_discard_sp(sfparse_parser *sfp) {
   for (; !parser_eof(sfp) && *sfp->pos == ' '; ++sfp->pos)
     ;
 }
 
-static void parser_set_op_state(sf_parser *sfp, uint32_t op) {
-  sfp->state &= ~SF_STATE_OP_MASK;
+static void parser_set_op_state(sfparse_parser *sfp, uint32_t op) {
+  sfp->state &= ~SFPARSE_STATE_OP_MASK;
   sfp->state |= op;
 }
 
-static void parser_unset_inner_list_state(sf_parser *sfp) {
-  sfp->state &= ~SF_STATE_INNER_LIST;
+static void parser_unset_inner_list_state(sfparse_parser *sfp) {
+  sfp->state &= ~SFPARSE_STATE_INNER_LIST;
 }
 
-static int parser_key(sf_parser *sfp, sf_vec *dest) {
+#ifdef __AVX2__
+static const uint8_t *find_char_key(const uint8_t *first, const uint8_t *last) {
+  const __m256i us = _mm256_set1_epi8('_');
+  const __m256i ds = _mm256_set1_epi8('-');
+  const __m256i dot = _mm256_set1_epi8('.');
+  const __m256i ast = _mm256_set1_epi8('*');
+  const __m256i r0l = _mm256_set1_epi8('0' - 1);
+  const __m256i r0r = _mm256_set1_epi8('9' + 1);
+  const __m256i r1l = _mm256_set1_epi8('a' - 1);
+  const __m256i r1r = _mm256_set1_epi8('z' + 1);
+  __m256i s, x;
+  uint32_t m;
+
+  for (; first != last; first += 32) {
+    s = _mm256_loadu_si256((void *)first);
+
+    x = _mm256_cmpeq_epi8(s, us);
+    x = _mm256_or_si256(_mm256_cmpeq_epi8(s, ds), x);
+    x = _mm256_or_si256(_mm256_cmpeq_epi8(s, dot), x);
+    x = _mm256_or_si256(_mm256_cmpeq_epi8(s, ast), x);
+    x = _mm256_or_si256(
+      _mm256_and_si256(_mm256_cmpgt_epi8(s, r0l), _mm256_cmpgt_epi8(r0r, s)),
+      x);
+    x = _mm256_or_si256(
+      _mm256_and_si256(_mm256_cmpgt_epi8(s, r1l), _mm256_cmpgt_epi8(r1r, s)),
+      x);
+
+    m = ~(uint32_t)_mm256_movemask_epi8(x);
+    if (m) {
+      return first + ctz(m);
+    }
+  }
+
+  return last;
+}
+#endif /* __AVX2__ */
+
+static int parser_key(sfparse_parser *sfp, sfparse_vec *dest) {
   const uint8_t *base;
+#ifdef __AVX2__
+  const uint8_t *last;
+#endif /* __AVX2__ */
 
   switch (*sfp->pos) {
   case '*':
   LCALPHA_CASES:
     break;
   default:
-    return SF_ERR_PARSE_ERROR;
+    return SFPARSE_ERR_PARSE;
   }
 
   base = sfp->pos++;
 
+#ifdef __AVX2__
+  if (sfp->end - sfp->pos >= 32) {
+    last = sfp->pos + ((sfp->end - sfp->pos) & ~0x1fu);
+
+    sfp->pos = find_char_key(sfp->pos, last);
+    if (sfp->pos != last) {
+      goto fin;
+    }
+  }
+#endif /* __AVX2__ */
+
   for (; !parser_eof(sfp); ++sfp->pos) {
     switch (*sfp->pos) {
     case '_':
@@ -428,6 +504,9 @@ static int parser_key(sf_parser *sfp, sf_vec *dest) {
     break;
   }
 
+#ifdef __AVX2__
+fin:
+#endif /* __AVX2__ */
   if (dest) {
     dest->base = (uint8_t *)base;
     dest->len = (size_t)(sfp->pos - dest->base);
@@ -436,7 +515,7 @@ static int parser_key(sf_parser *sfp, sf_vec *dest) {
   return 0;
 }
 
-static int parser_number(sf_parser *sfp, sf_value *dest) {
+static int parser_number(sfparse_parser *sfp, sfparse_value *dest) {
   int sign = 1;
   int64_t value = 0;
   size_t len = 0;
@@ -445,7 +524,7 @@ static int parser_number(sf_parser *sfp, sf_value *dest) {
   if (*sfp->pos == '-') {
     ++sfp->pos;
     if (parser_eof(sfp)) {
-      return SF_ERR_PARSE_ERROR;
+      return SFPARSE_ERR_PARSE;
     }
 
     sign = -1;
@@ -457,7 +536,7 @@ static int parser_number(sf_parser *sfp, sf_value *dest) {
     switch (*sfp->pos) {
     DIGIT_CASES:
       if (++len > 15) {
-        return SF_ERR_PARSE_ERROR;
+        return SFPARSE_ERR_PARSE;
       }
 
       value *= 10;
@@ -470,13 +549,13 @@ static int parser_number(sf_parser *sfp, sf_value *dest) {
   }
 
   if (len == 0) {
-    return SF_ERR_PARSE_ERROR;
+    return SFPARSE_ERR_PARSE;
   }
 
   if (parser_eof(sfp) || *sfp->pos != '.') {
     if (dest) {
-      dest->type = SF_TYPE_INTEGER;
-      dest->flags = SF_VALUE_FLAG_NONE;
+      dest->type = SFPARSE_TYPE_INTEGER;
+      dest->flags = SFPARSE_VALUE_FLAG_NONE;
       dest->integer = value * sign;
     }
 
@@ -486,7 +565,7 @@ static int parser_number(sf_parser *sfp, sf_value *dest) {
   /* decimal */
 
   if (len > 12) {
-    return SF_ERR_PARSE_ERROR;
+    return SFPARSE_ERR_PARSE;
   }
 
   fpos = len;
@@ -497,7 +576,7 @@ static int parser_number(sf_parser *sfp, sf_value *dest) {
     switch (*sfp->pos) {
     DIGIT_CASES:
       if (++len > 15) {
-        return SF_ERR_PARSE_ERROR;
+        return SFPARSE_ERR_PARSE;
       }
 
       value *= 10;
@@ -510,12 +589,12 @@ static int parser_number(sf_parser *sfp, sf_value *dest) {
   }
 
   if (fpos == len || len - fpos > 3) {
-    return SF_ERR_PARSE_ERROR;
+    return SFPARSE_ERR_PARSE;
   }
 
   if (dest) {
-    dest->type = SF_TYPE_DECIMAL;
-    dest->flags = SF_VALUE_FLAG_NONE;
+    dest->type = SFPARSE_TYPE_DECIMAL;
+    dest->flags = SFPARSE_VALUE_FLAG_NONE;
     dest->decimal.numer = value * sign;
 
     switch (len - fpos) {
@@ -537,9 +616,9 @@ static int parser_number(sf_parser *sfp, sf_value *dest) {
   return 0;
 }
 
-static int parser_date(sf_parser *sfp, sf_value *dest) {
+static int parser_date(sfparse_parser *sfp, sfparse_value *dest) {
   int rv;
-  sf_value val;
+  sfparse_value val;
 
   /* The first byte has already been validated by the caller. */
   assert('@' == *sfp->pos);
@@ -547,7 +626,7 @@ static int parser_date(sf_parser *sfp, sf_value *dest) {
   ++sfp->pos;
 
   if (parser_eof(sfp)) {
-    return SF_ERR_PARSE_ERROR;
+    return SFPARSE_ERR_PARSE;
   }
 
   rv = parser_number(sfp, &val);
@@ -555,27 +634,93 @@ static int parser_date(sf_parser *sfp, sf_value *dest) {
     return rv;
   }
 
-  if (val.type != SF_TYPE_INTEGER) {
-    return SF_ERR_PARSE_ERROR;
+  if (val.type != SFPARSE_TYPE_INTEGER) {
+    return SFPARSE_ERR_PARSE;
   }
 
   if (dest) {
     *dest = val;
-    dest->type = SF_TYPE_DATE;
+    dest->type = SFPARSE_TYPE_DATE;
   }
 
   return 0;
 }
 
-static int parser_string(sf_parser *sfp, sf_value *dest) {
+#ifdef __AVX2__
+static const uint8_t *find_char_string(const uint8_t *first,
+                                       const uint8_t *last) {
+  const __m256i bs = _mm256_set1_epi8('\\');
+  const __m256i dq = _mm256_set1_epi8('"');
+  const __m256i del = _mm256_set1_epi8(0x7f);
+  const __m256i sp = _mm256_set1_epi8(' ');
+  __m256i s, x;
+  uint32_t m;
+
+  for (; first != last; first += 32) {
+    s = _mm256_loadu_si256((void *)first);
+
+    x = _mm256_cmpgt_epi8(sp, s);
+    x = _mm256_or_si256(_mm256_cmpeq_epi8(s, bs), x);
+    x = _mm256_or_si256(_mm256_cmpeq_epi8(s, dq), x);
+    x = _mm256_or_si256(_mm256_cmpeq_epi8(s, del), x);
+
+    m = (uint32_t)_mm256_movemask_epi8(x);
+    if (m) {
+      return first + ctz(m);
+    }
+  }
+
+  return last;
+}
+#endif /* __AVX2__ */
+
+static int parser_string(sfparse_parser *sfp, sfparse_value *dest) {
   const uint8_t *base;
-  uint32_t flags = SF_VALUE_FLAG_NONE;
+#ifdef __AVX2__
+  const uint8_t *last;
+#endif /* __AVX2__ */
+  uint32_t flags = SFPARSE_VALUE_FLAG_NONE;
 
   /* The first byte has already been validated by the caller. */
   assert('"' == *sfp->pos);
 
   base = ++sfp->pos;
 
+#ifdef __AVX2__
+  for (; sfp->end - sfp->pos >= 32; ++sfp->pos) {
+    last = sfp->pos + ((sfp->end - sfp->pos) & ~0x1fu);
+
+    sfp->pos = find_char_string(sfp->pos, last);
+    if (sfp->pos == last) {
+      break;
+    }
+
+    switch (*sfp->pos) {
+    case '\\':
+      ++sfp->pos;
+      if (parser_eof(sfp)) {
+        return SFPARSE_ERR_PARSE;
+      }
+
+      switch (*sfp->pos) {
+      case '"':
+      case '\\':
+        flags = SFPARSE_VALUE_FLAG_ESCAPED_STRING;
+
+        break;
+      default:
+        return SFPARSE_ERR_PARSE;
+      }
+
+      break;
+    case '"':
+      goto fin;
+    default:
+      return SFPARSE_ERR_PARSE;
+    }
+  }
+#endif /* __AVX2__ */
+
   for (; !parser_eof(sfp); ++sfp->pos) {
     switch (*sfp->pos) {
     X20_21_CASES:
@@ -585,45 +730,116 @@ static int parser_string(sf_parser *sfp, sf_value *dest) {
     case '\\':
       ++sfp->pos;
       if (parser_eof(sfp)) {
-        return SF_ERR_PARSE_ERROR;
+        return SFPARSE_ERR_PARSE;
       }
 
       switch (*sfp->pos) {
       case '"':
       case '\\':
-        flags = SF_VALUE_FLAG_ESCAPED_STRING;
+        flags = SFPARSE_VALUE_FLAG_ESCAPED_STRING;
 
         break;
       default:
-        return SF_ERR_PARSE_ERROR;
+        return SFPARSE_ERR_PARSE;
       }
 
       break;
     case '"':
-      if (dest) {
-        dest->type = SF_TYPE_STRING;
-        dest->flags = flags;
-        dest->vec.len = (size_t)(sfp->pos - base);
-        dest->vec.base = dest->vec.len == 0 ? NULL : (uint8_t *)base;
-      }
-
-      ++sfp->pos;
-
-      return 0;
+      goto fin;
     default:
-      return SF_ERR_PARSE_ERROR;
+      return SFPARSE_ERR_PARSE;
     }
   }
 
-  return SF_ERR_PARSE_ERROR;
+  return SFPARSE_ERR_PARSE;
+
+fin:
+  if (dest) {
+    dest->type = SFPARSE_TYPE_STRING;
+    dest->flags = flags;
+    dest->vec.len = (size_t)(sfp->pos - base);
+    dest->vec.base = dest->vec.len == 0 ? NULL : (uint8_t *)base;
+  }
+
+  ++sfp->pos;
+
+  return 0;
 }
 
-static int parser_token(sf_parser *sfp, sf_value *dest) {
+#ifdef __AVX2__
+static const uint8_t *find_char_token(const uint8_t *first,
+                                      const uint8_t *last) {
+  /* r0: !..:, excluding "(),
+     r1: A..Z
+     r2: ^..~, excluding {} */
+  const __m256i r0l = _mm256_set1_epi8('!' - 1);
+  const __m256i r0r = _mm256_set1_epi8(':' + 1);
+  const __m256i dq = _mm256_set1_epi8('"');
+  const __m256i prl = _mm256_set1_epi8('(');
+  const __m256i prr = _mm256_set1_epi8(')');
+  const __m256i comma = _mm256_set1_epi8(',');
+  const __m256i r1l = _mm256_set1_epi8('A' - 1);
+  const __m256i r1r = _mm256_set1_epi8('Z' + 1);
+  const __m256i r2l = _mm256_set1_epi8('^' - 1);
+  const __m256i r2r = _mm256_set1_epi8('~' + 1);
+  const __m256i cbl = _mm256_set1_epi8('{');
+  const __m256i cbr = _mm256_set1_epi8('}');
+  __m256i s, x;
+  uint32_t m;
+
+  for (; first != last; first += 32) {
+    s = _mm256_loadu_si256((void *)first);
+
+    x = _mm256_andnot_si256(
+      _mm256_cmpeq_epi8(s, comma),
+      _mm256_andnot_si256(
+        _mm256_cmpeq_epi8(s, prr),
+        _mm256_andnot_si256(
+          _mm256_cmpeq_epi8(s, prl),
+          _mm256_andnot_si256(_mm256_cmpeq_epi8(s, dq),
+                              _mm256_and_si256(_mm256_cmpgt_epi8(s, r0l),
+                                               _mm256_cmpgt_epi8(r0r, s))))));
+    x = _mm256_or_si256(
+      _mm256_and_si256(_mm256_cmpgt_epi8(s, r1l), _mm256_cmpgt_epi8(r1r, s)),
+      x);
+    x = _mm256_or_si256(
+      _mm256_andnot_si256(
+        _mm256_cmpeq_epi8(s, cbr),
+        _mm256_andnot_si256(_mm256_cmpeq_epi8(s, cbl),
+                            _mm256_and_si256(_mm256_cmpgt_epi8(s, r2l),
+                                             _mm256_cmpgt_epi8(r2r, s)))),
+      x);
+
+    m = ~(uint32_t)_mm256_movemask_epi8(x);
+    if (m) {
+      return first + ctz(m);
+    }
+  }
+
+  return last;
+}
+#endif /* __AVX2__ */
+
+static int parser_token(sfparse_parser *sfp, sfparse_value *dest) {
   const uint8_t *base;
+#ifdef __AVX2__
+  const uint8_t *last;
+#endif /* __AVX2__ */
 
   /* The first byte has already been validated by the caller. */
   base = sfp->pos++;
 
+#ifdef __AVX2__
+  if (sfp->end - sfp->pos >= 32) {
+    last = sfp->pos + ((sfp->end - sfp->pos) & ~0x1fu);
+
+    sfp->pos = find_char_token(sfp->pos, last);
+    if (sfp->pos != last) {
+      goto fin;
+    }
+  }
+#endif /* __AVX2__ */
+
   for (; !parser_eof(sfp); ++sfp->pos) {
     switch (*sfp->pos) {
     TOKEN_CASES:
@@ -633,9 +849,12 @@ static int parser_token(sf_parser *sfp, sf_value *dest) {
     break;
   }
 
+#ifdef __AVX2__
+fin:
+#endif /* __AVX2__ */
   if (dest) {
-    dest->type = SF_TYPE_TOKEN;
-    dest->flags = SF_VALUE_FLAG_NONE;
+    dest->type = SFPARSE_TYPE_TOKEN;
+    dest->flags = SFPARSE_VALUE_FLAG_NONE;
     dest->vec.base = (uint8_t *)base;
     dest->vec.len = (size_t)(sfp->pos - base);
   }
@@ -643,14 +862,63 @@ static int parser_token(sf_parser *sfp, sf_value *dest) {
   return 0;
 }
 
-static int parser_byteseq(sf_parser *sfp, sf_value *dest) {
+#ifdef __AVX2__
+static const uint8_t *find_char_byteseq(const uint8_t *first,
+                                        const uint8_t *last) {
+  const __m256i pls = _mm256_set1_epi8('+');
+  const __m256i fs = _mm256_set1_epi8('/');
+  const __m256i r0l = _mm256_set1_epi8('0' - 1);
+  const __m256i r0r = _mm256_set1_epi8('9' + 1);
+  const __m256i r1l = _mm256_set1_epi8('A' - 1);
+  const __m256i r1r = _mm256_set1_epi8('Z' + 1);
+  const __m256i r2l = _mm256_set1_epi8('a' - 1);
+  const __m256i r2r = _mm256_set1_epi8('z' + 1);
+  __m256i s, x;
+  uint32_t m;
+
+  for (; first != last; first += 32) {
+    s = _mm256_loadu_si256((void *)first);
+
+    x = _mm256_cmpeq_epi8(s, pls);
+    x = _mm256_or_si256(_mm256_cmpeq_epi8(s, fs), x);
+    x = _mm256_or_si256(
+      _mm256_and_si256(_mm256_cmpgt_epi8(s, r0l), _mm256_cmpgt_epi8(r0r, s)),
+      x);
+    x = _mm256_or_si256(
+      _mm256_and_si256(_mm256_cmpgt_epi8(s, r1l), _mm256_cmpgt_epi8(r1r, s)),
+      x);
+    x = _mm256_or_si256(
+      _mm256_and_si256(_mm256_cmpgt_epi8(s, r2l), _mm256_cmpgt_epi8(r2r, s)),
+      x);
+
+    m = ~(uint32_t)_mm256_movemask_epi8(x);
+    if (m) {
+      return first + ctz(m);
+    }
+  }
+
+  return last;
+}
+#endif /* __AVX2__ */
+
+static int parser_byteseq(sfparse_parser *sfp, sfparse_value *dest) {
   const uint8_t *base;
+#ifdef __AVX2__
+  const uint8_t *last;
+#endif /* __AVX2__ */
 
   /* The first byte has already been validated by the caller. */
   assert(':' == *sfp->pos);
 
   base = ++sfp->pos;
 
+#ifdef __AVX2__
+  if (sfp->end - sfp->pos >= 32) {
+    last = sfp->pos + ((sfp->end - sfp->pos) & ~0x1fu);
+    sfp->pos = find_char_byteseq(sfp->pos, last);
+  }
+#endif /* __AVX2__ */
+
   for (; !parser_eof(sfp); ++sfp->pos) {
     switch (*sfp->pos) {
     case '+':
@@ -662,12 +930,12 @@ static int parser_byteseq(sf_parser *sfp, sf_value *dest) {
       switch ((sfp->pos - base) & 0x3) {
       case 0:
       case 1:
-        return SF_ERR_PARSE_ERROR;
+        return SFPARSE_ERR_PARSE;
       case 2:
         ++sfp->pos;
 
         if (parser_eof(sfp)) {
-          return SF_ERR_PARSE_ERROR;
+          return SFPARSE_ERR_PARSE;
         }
 
         if (*sfp->pos == '=') {
@@ -682,27 +950,27 @@ static int parser_byteseq(sf_parser *sfp, sf_value *dest) {
       }
 
       if (parser_eof(sfp) || *sfp->pos != ':') {
-        return SF_ERR_PARSE_ERROR;
+        return SFPARSE_ERR_PARSE;
       }
 
       goto fin;
     case ':':
       if (((sfp->pos - base) & 0x3) == 1) {
-        return SF_ERR_PARSE_ERROR;
+        return SFPARSE_ERR_PARSE;
       }
 
       goto fin;
     default:
-      return SF_ERR_PARSE_ERROR;
+      return SFPARSE_ERR_PARSE;
     }
   }
 
-  return SF_ERR_PARSE_ERROR;
+  return SFPARSE_ERR_PARSE;
 
 fin:
   if (dest) {
-    dest->type = SF_TYPE_BYTESEQ;
-    dest->flags = SF_VALUE_FLAG_NONE;
+    dest->type = SFPARSE_TYPE_BYTESEQ;
+    dest->flags = SFPARSE_VALUE_FLAG_NONE;
     dest->vec.len = (size_t)(sfp->pos - base);
     dest->vec.base = dest->vec.len == 0 ? NULL : (uint8_t *)base;
   }
@@ -712,7 +980,7 @@ fin:
   return 0;
 }
 
-static int parser_boolean(sf_parser *sfp, sf_value *dest) {
+static int parser_boolean(sfparse_parser *sfp, sfparse_value *dest) {
   int b;
 
   /* The first byte has already been validated by the caller. */
@@ -721,7 +989,7 @@ static int parser_boolean(sf_parser *sfp, sf_value *dest) {
   ++sfp->pos;
 
   if (parser_eof(sfp)) {
-    return SF_ERR_PARSE_ERROR;
+    return SFPARSE_ERR_PARSE;
   }
 
   switch (*sfp->pos) {
@@ -734,14 +1002,14 @@ static int parser_boolean(sf_parser *sfp, sf_value *dest) {
 
     break;
   default:
-    return SF_ERR_PARSE_ERROR;
+    return SFPARSE_ERR_PARSE;
   }
 
   ++sfp->pos;
 
   if (dest) {
-    dest->type = SF_TYPE_BOOLEAN;
-    dest->flags = SF_VALUE_FLAG_NONE;
+    dest->type = SFPARSE_TYPE_BOOLEAN;
+    dest->flags = SFPARSE_VALUE_FLAG_NONE;
     dest->boolean = b;
   }
 
@@ -847,7 +1115,7 @@ static void utf8_decode(uint32_t *state, uint8_t byte) {
 
 /* End of utf8 dfa */
 
-static int parser_dispstring(sf_parser *sfp, sf_value *dest) {
+static int parser_dispstring(sfparse_parser *sfp, sfparse_value *dest) {
   const uint8_t *base;
   uint8_t c;
   uint32_t utf8state = UTF8_ACCEPT;
@@ -857,7 +1125,7 @@ static int parser_dispstring(sf_parser *sfp, sf_value *dest) {
   ++sfp->pos;
 
   if (parser_eof(sfp) || *sfp->pos != '"') {
-    return SF_ERR_PARSE_ERROR;
+    return SFPARSE_ERR_PARSE;
   }
 
   base = ++sfp->pos;
@@ -866,32 +1134,32 @@ static int parser_dispstring(sf_parser *sfp, sf_value *dest) {
     switch (*sfp->pos) {
     X00_1F_CASES:
     X7F_FF_CASES:
-      return SF_ERR_PARSE_ERROR;
+      return SFPARSE_ERR_PARSE;
     case '%':
       ++sfp->pos;
 
       if (sfp->pos + 2 > sfp->end) {
-        return SF_ERR_PARSE_ERROR;
+        return SFPARSE_ERR_PARSE;
       }
 
       if (pctdecode(&c, &sfp->pos) != 0) {
-        return SF_ERR_PARSE_ERROR;
+        return SFPARSE_ERR_PARSE;
       }
 
       utf8_decode(&utf8state, c);
       if (utf8state == UTF8_REJECT) {
-        return SF_ERR_PARSE_ERROR;
+        return SFPARSE_ERR_PARSE;
       }
 
       break;
     case '"':
       if (utf8state != UTF8_ACCEPT) {
-        return SF_ERR_PARSE_ERROR;
+        return SFPARSE_ERR_PARSE;
       }
 
       if (dest) {
-        dest->type = SF_TYPE_DISPSTRING;
-        dest->flags = SF_VALUE_FLAG_NONE;
+        dest->type = SFPARSE_TYPE_DISPSTRING;
+        dest->flags = SFPARSE_VALUE_FLAG_NONE;
         dest->vec.len = (size_t)(sfp->pos - base);
         dest->vec.base = dest->vec.len == 0 ? NULL : (uint8_t *)base;
       }
@@ -901,17 +1169,17 @@ static int parser_dispstring(sf_parser *sfp, sf_value *dest) {
       return 0;
     default:
       if (utf8state != UTF8_ACCEPT) {
-        return SF_ERR_PARSE_ERROR;
+        return SFPARSE_ERR_PARSE;
       }
 
       ++sfp->pos;
     }
   }
 
-  return SF_ERR_PARSE_ERROR;
+  return SFPARSE_ERR_PARSE;
 }
 
-static int parser_bare_item(sf_parser *sfp, sf_value *dest) {
+static int parser_bare_item(sfparse_parser *sfp, sfparse_value *dest) {
   switch (*sfp->pos) {
   case '"':
     return parser_string(sfp, dest);
@@ -930,28 +1198,29 @@ static int parser_bare_item(sf_parser *sfp, sf_value *dest) {
   case '%':
     return parser_dispstring(sfp, dest);
   default:
-    return SF_ERR_PARSE_ERROR;
+    return SFPARSE_ERR_PARSE;
   }
 }
 
-static int parser_skip_inner_list(sf_parser *sfp);
+static int parser_skip_inner_list(sfparse_parser *sfp);
 
-int sf_parser_param(sf_parser *sfp, sf_vec *dest_key, sf_value *dest_value) {
+int sfparse_parser_param(sfparse_parser *sfp, sfparse_vec *dest_key,
+                         sfparse_value *dest_value) {
   int rv;
 
-  switch (sfp->state & SF_STATE_OP_MASK) {
-  case SF_STATE_BEFORE:
+  switch (sfp->state & SFPARSE_STATE_OP_MASK) {
+  case SFPARSE_STATE_BEFORE:
     rv = parser_skip_inner_list(sfp);
     if (rv != 0) {
       return rv;
     }
 
     /* fall through */
-  case SF_STATE_BEFORE_PARAMS:
-    parser_set_op_state(sfp, SF_STATE_PARAMS);
+  case SFPARSE_STATE_BEFORE_PARAMS:
+    parser_set_op_state(sfp, SFPARSE_STATE_PARAMS);
 
     break;
-  case SF_STATE_PARAMS:
+  case SFPARSE_STATE_PARAMS:
     break;
   default:
     assert(0);
@@ -959,16 +1228,16 @@ int sf_parser_param(sf_parser *sfp, sf_vec *dest_key, sf_value *dest_value) {
   }
 
   if (parser_eof(sfp) || *sfp->pos != ';') {
-    parser_set_op_state(sfp, SF_STATE_AFTER);
+    parser_set_op_state(sfp, SFPARSE_STATE_AFTER);
 
-    return SF_ERR_EOF;
+    return SFPARSE_ERR_EOF;
   }
 
   ++sfp->pos;
 
   parser_discard_sp(sfp);
   if (parser_eof(sfp)) {
-    return SF_ERR_PARSE_ERROR;
+    return SFPARSE_ERR_PARSE;
   }
 
   rv = parser_key(sfp, dest_key);
@@ -978,8 +1247,8 @@ int sf_parser_param(sf_parser *sfp, sf_vec *dest_key, sf_value *dest_value) {
 
   if (parser_eof(sfp) || *sfp->pos != '=') {
     if (dest_value) {
-      dest_value->type = SF_TYPE_BOOLEAN;
-      dest_value->flags = SF_VALUE_FLAG_NONE;
+      dest_value->type = SFPARSE_TYPE_BOOLEAN;
+      dest_value->flags = SFPARSE_VALUE_FLAG_NONE;
       dest_value->boolean = 1;
     }
 
@@ -989,23 +1258,23 @@ int sf_parser_param(sf_parser *sfp, sf_vec *dest_key, sf_value *dest_value) {
   ++sfp->pos;
 
   if (parser_eof(sfp)) {
-    return SF_ERR_PARSE_ERROR;
+    return SFPARSE_ERR_PARSE;
   }
 
   return parser_bare_item(sfp, dest_value);
 }
 
-static int parser_skip_params(sf_parser *sfp) {
+static int parser_skip_params(sfparse_parser *sfp) {
   int rv;
 
   for (;;) {
-    rv = sf_parser_param(sfp, NULL, NULL);
+    rv = sfparse_parser_param(sfp, NULL, NULL);
     switch (rv) {
     case 0:
       break;
-    case SF_ERR_EOF:
+    case SFPARSE_ERR_EOF:
       return 0;
-    case SF_ERR_PARSE_ERROR:
+    case SFPARSE_ERR_PARSE:
       return rv;
     default:
       assert(0);
@@ -1014,45 +1283,45 @@ static int parser_skip_params(sf_parser *sfp) {
   }
 }
 
-int sf_parser_inner_list(sf_parser *sfp, sf_value *dest) {
+int sfparse_parser_inner_list(sfparse_parser *sfp, sfparse_value *dest) {
   int rv;
 
-  switch (sfp->state & SF_STATE_OP_MASK) {
-  case SF_STATE_BEFORE:
+  switch (sfp->state & SFPARSE_STATE_OP_MASK) {
+  case SFPARSE_STATE_BEFORE:
     parser_discard_sp(sfp);
     if (parser_eof(sfp)) {
-      return SF_ERR_PARSE_ERROR;
+      return SFPARSE_ERR_PARSE;
     }
 
     break;
-  case SF_STATE_BEFORE_PARAMS:
+  case SFPARSE_STATE_BEFORE_PARAMS:
     rv = parser_skip_params(sfp);
     if (rv != 0) {
       return rv;
     }
 
-    /* Technically, we are entering SF_STATE_AFTER, but we will set
+    /* Technically, we are entering SFPARSE_STATE_AFTER, but we will set
        another state without reading the state. */
-    /* parser_set_op_state(sfp, SF_STATE_AFTER); */
+    /* parser_set_op_state(sfp, SFPARSE_STATE_AFTER); */
 
     /* fall through */
-  case SF_STATE_AFTER:
+  case SFPARSE_STATE_AFTER:
     if (parser_eof(sfp)) {
-      return SF_ERR_PARSE_ERROR;
+      return SFPARSE_ERR_PARSE;
     }
 
     switch (*sfp->pos) {
     case ' ':
       parser_discard_sp(sfp);
       if (parser_eof(sfp)) {
-        return SF_ERR_PARSE_ERROR;
+        return SFPARSE_ERR_PARSE;
       }
 
       break;
     case ')':
       break;
     default:
-      return SF_ERR_PARSE_ERROR;
+      return SFPARSE_ERR_PARSE;
     }
 
     break;
@@ -1065,9 +1334,9 @@ int sf_parser_inner_list(sf_parser *sfp, sf_value *dest) {
     ++sfp->pos;
 
     parser_unset_inner_list_state(sfp);
-    parser_set_op_state(sfp, SF_STATE_BEFORE_PARAMS);
+    parser_set_op_state(sfp, SFPARSE_STATE_BEFORE_PARAMS);
 
-    return SF_ERR_EOF;
+    return SFPARSE_ERR_EOF;
   }
 
   rv = parser_bare_item(sfp, dest);
@@ -1075,22 +1344,22 @@ int sf_parser_inner_list(sf_parser *sfp, sf_value *dest) {
     return rv;
   }
 
-  parser_set_op_state(sfp, SF_STATE_BEFORE_PARAMS);
+  parser_set_op_state(sfp, SFPARSE_STATE_BEFORE_PARAMS);
 
   return 0;
 }
 
-static int parser_skip_inner_list(sf_parser *sfp) {
+static int parser_skip_inner_list(sfparse_parser *sfp) {
   int rv;
 
   for (;;) {
-    rv = sf_parser_inner_list(sfp, NULL);
+    rv = sfparse_parser_inner_list(sfp, NULL);
     switch (rv) {
     case 0:
       break;
-    case SF_ERR_EOF:
+    case SFPARSE_ERR_EOF:
       return 0;
-    case SF_ERR_PARSE_ERROR:
+    case SFPARSE_ERR_PARSE:
       return rv;
     default:
       assert(0);
@@ -1099,39 +1368,39 @@ static int parser_skip_inner_list(sf_parser *sfp) {
   }
 }
 
-static int parser_next_key_or_item(sf_parser *sfp) {
+static int parser_next_key_or_item(sfparse_parser *sfp) {
   parser_discard_ows(sfp);
 
   if (parser_eof(sfp)) {
-    return SF_ERR_EOF;
+    return SFPARSE_ERR_EOF;
   }
 
   if (*sfp->pos != ',') {
-    return SF_ERR_PARSE_ERROR;
+    return SFPARSE_ERR_PARSE;
   }
 
   ++sfp->pos;
 
   parser_discard_ows(sfp);
   if (parser_eof(sfp)) {
-    return SF_ERR_PARSE_ERROR;
+    return SFPARSE_ERR_PARSE;
   }
 
   return 0;
 }
 
-static int parser_dict_value(sf_parser *sfp, sf_value *dest) {
+static int parser_dict_value(sfparse_parser *sfp, sfparse_value *dest) {
   int rv;
 
   if (parser_eof(sfp) || *(sfp->pos) != '=') {
     /* Boolean true */
     if (dest) {
-      dest->type = SF_TYPE_BOOLEAN;
-      dest->flags = SF_VALUE_FLAG_NONE;
+      dest->type = SFPARSE_TYPE_BOOLEAN;
+      dest->flags = SFPARSE_VALUE_FLAG_NONE;
       dest->boolean = 1;
     }
 
-    sfp->state = SF_STATE_DICT_BEFORE_PARAMS;
+    sfp->state = SFPARSE_STATE_DICT_BEFORE_PARAMS;
 
     return 0;
   }
@@ -1139,18 +1408,18 @@ static int parser_dict_value(sf_parser *sfp, sf_value *dest) {
   ++sfp->pos;
 
   if (parser_eof(sfp)) {
-    return SF_ERR_PARSE_ERROR;
+    return SFPARSE_ERR_PARSE;
   }
 
   if (*sfp->pos == '(') {
     if (dest) {
-      dest->type = SF_TYPE_INNER_LIST;
-      dest->flags = SF_VALUE_FLAG_NONE;
+      dest->type = SFPARSE_TYPE_INNER_LIST;
+      dest->flags = SFPARSE_VALUE_FLAG_NONE;
     }
 
     ++sfp->pos;
 
-    sfp->state = SF_STATE_DICT_INNER_LIST_BEFORE;
+    sfp->state = SFPARSE_STATE_DICT_INNER_LIST_BEFORE;
 
     return 0;
   }
@@ -1160,41 +1429,42 @@ static int parser_dict_value(sf_parser *sfp, sf_value *dest) {
     return rv;
   }
 
-  sfp->state = SF_STATE_DICT_BEFORE_PARAMS;
+  sfp->state = SFPARSE_STATE_DICT_BEFORE_PARAMS;
 
   return 0;
 }
 
-int sf_parser_dict(sf_parser *sfp, sf_vec *dest_key, sf_value *dest_value) {
+int sfparse_parser_dict(sfparse_parser *sfp, sfparse_vec *dest_key,
+                        sfparse_value *dest_value) {
   int rv;
 
   switch (sfp->state) {
-  case SF_STATE_DICT_INNER_LIST_BEFORE:
+  case SFPARSE_STATE_DICT_INNER_LIST_BEFORE:
     rv = parser_skip_inner_list(sfp);
     if (rv != 0) {
       return rv;
     }
 
     /* fall through */
-  case SF_STATE_DICT_BEFORE_PARAMS:
+  case SFPARSE_STATE_DICT_BEFORE_PARAMS:
     rv = parser_skip_params(sfp);
     if (rv != 0) {
       return rv;
     }
 
     /* fall through */
-  case SF_STATE_DICT_AFTER:
+  case SFPARSE_STATE_DICT_AFTER:
     rv = parser_next_key_or_item(sfp);
     if (rv != 0) {
       return rv;
     }
 
     break;
-  case SF_STATE_INITIAL:
+  case SFPARSE_STATE_INITIAL:
     parser_discard_sp(sfp);
 
     if (parser_eof(sfp)) {
-      return SF_ERR_EOF;
+      return SFPARSE_ERR_EOF;
     }
 
     break;
@@ -1211,36 +1481,36 @@ int sf_parser_dict(sf_parser *sfp, sf_vec *dest_key, sf_value *dest_value) {
   return parser_dict_value(sfp, dest_value);
 }
 
-int sf_parser_list(sf_parser *sfp, sf_value *dest) {
+int sfparse_parser_list(sfparse_parser *sfp, sfparse_value *dest) {
   int rv;
 
   switch (sfp->state) {
-  case SF_STATE_LIST_INNER_LIST_BEFORE:
+  case SFPARSE_STATE_LIST_INNER_LIST_BEFORE:
     rv = parser_skip_inner_list(sfp);
     if (rv != 0) {
       return rv;
     }
 
     /* fall through */
-  case SF_STATE_LIST_BEFORE_PARAMS:
+  case SFPARSE_STATE_LIST_BEFORE_PARAMS:
     rv = parser_skip_params(sfp);
     if (rv != 0) {
       return rv;
     }
 
     /* fall through */
-  case SF_STATE_LIST_AFTER:
+  case SFPARSE_STATE_LIST_AFTER:
     rv = parser_next_key_or_item(sfp);
     if (rv != 0) {
       return rv;
     }
 
     break;
-  case SF_STATE_INITIAL:
+  case SFPARSE_STATE_INITIAL:
     parser_discard_sp(sfp);
 
     if (parser_eof(sfp)) {
-      return SF_ERR_EOF;
+      return SFPARSE_ERR_EOF;
     }
 
     break;
@@ -1251,13 +1521,13 @@ int sf_parser_list(sf_parser *sfp, sf_value *dest) {
 
   if (*sfp->pos == '(') {
     if (dest) {
-      dest->type = SF_TYPE_INNER_LIST;
-      dest->flags = SF_VALUE_FLAG_NONE;
+      dest->type = SFPARSE_TYPE_INNER_LIST;
+      dest->flags = SFPARSE_VALUE_FLAG_NONE;
     }
 
     ++sfp->pos;
 
-    sfp->state = SF_STATE_LIST_INNER_LIST_BEFORE;
+    sfp->state = SFPARSE_STATE_LIST_INNER_LIST_BEFORE;
 
     return 0;
   }
@@ -1267,45 +1537,45 @@ int sf_parser_list(sf_parser *sfp, sf_value *dest) {
     return rv;
   }
 
-  sfp->state = SF_STATE_LIST_BEFORE_PARAMS;
+  sfp->state = SFPARSE_STATE_LIST_BEFORE_PARAMS;
 
   return 0;
 }
 
-int sf_parser_item(sf_parser *sfp, sf_value *dest) {
+int sfparse_parser_item(sfparse_parser *sfp, sfparse_value *dest) {
   int rv;
 
   switch (sfp->state) {
-  case SF_STATE_INITIAL:
+  case SFPARSE_STATE_INITIAL:
     parser_discard_sp(sfp);
 
     if (parser_eof(sfp)) {
-      return SF_ERR_PARSE_ERROR;
+      return SFPARSE_ERR_PARSE;
     }
 
     break;
-  case SF_STATE_ITEM_INNER_LIST_BEFORE:
+  case SFPARSE_STATE_ITEM_INNER_LIST_BEFORE:
     rv = parser_skip_inner_list(sfp);
     if (rv != 0) {
       return rv;
     }
 
     /* fall through */
-  case SF_STATE_ITEM_BEFORE_PARAMS:
+  case SFPARSE_STATE_ITEM_BEFORE_PARAMS:
     rv = parser_skip_params(sfp);
     if (rv != 0) {
       return rv;
     }
 
     /* fall through */
-  case SF_STATE_ITEM_AFTER:
+  case SFPARSE_STATE_ITEM_AFTER:
     parser_discard_sp(sfp);
 
     if (!parser_eof(sfp)) {
-      return SF_ERR_PARSE_ERROR;
+      return SFPARSE_ERR_PARSE;
     }
 
-    return SF_ERR_EOF;
+    return SFPARSE_ERR_EOF;
   default:
     assert(0);
     abort();
@@ -1313,13 +1583,13 @@ int sf_parser_item(sf_parser *sfp, sf_value *dest) {
 
   if (*sfp->pos == '(') {
     if (dest) {
-      dest->type = SF_TYPE_INNER_LIST;
-      dest->flags = SF_VALUE_FLAG_NONE;
+      dest->type = SFPARSE_TYPE_INNER_LIST;
+      dest->flags = SFPARSE_VALUE_FLAG_NONE;
     }
 
     ++sfp->pos;
 
-    sfp->state = SF_STATE_ITEM_INNER_LIST_BEFORE;
+    sfp->state = SFPARSE_STATE_ITEM_INNER_LIST_BEFORE;
 
     return 0;
   }
@@ -1329,12 +1599,13 @@ int sf_parser_item(sf_parser *sfp, sf_value *dest) {
     return rv;
   }
 
-  sfp->state = SF_STATE_ITEM_BEFORE_PARAMS;
+  sfp->state = SFPARSE_STATE_ITEM_BEFORE_PARAMS;
 
   return 0;
 }
 
-void sf_parser_init(sf_parser *sfp, const uint8_t *data, size_t datalen) {
+void sfparse_parser_init(sfparse_parser *sfp, const uint8_t *data,
+                         size_t datalen) {
   if (datalen == 0) {
     sfp->pos = sfp->end = NULL;
   } else {
@@ -1342,10 +1613,10 @@ void sf_parser_init(sf_parser *sfp, const uint8_t *data, size_t datalen) {
     sfp->end = data + datalen;
   }
 
-  sfp->state = SF_STATE_INITIAL;
+  sfp->state = SFPARSE_STATE_INITIAL;
 }
 
-void sf_unescape(sf_vec *dest, const sf_vec *src) {
+void sfparse_unescape(sfparse_vec *dest, const sfparse_vec *src) {
   const uint8_t *p, *q;
   uint8_t *o;
   size_t len, slen;
@@ -1381,23 +1652,22 @@ void sf_unescape(sf_vec *dest, const sf_vec *src) {
   }
 }
 
-void sf_base64decode(sf_vec *dest, const sf_vec *src) {
+void sfparse_base64decode(sfparse_vec *dest, const sfparse_vec *src) {
   static const int index_tbl[] = {
-      -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-      -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-      -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63, 52, 53, 54, 55, 56, 57,
-      58, 59, 60, 61, -1, -1, -1, -1, -1, -1, -1, 0,  1,  2,  3,  4,  5,  6,
-      7,  8,  9,  10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24,
-      25, -1, -1, -1, -1, -1, -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36,
-      37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1,
-      -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-      -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-      -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-      -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-      -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-      -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-      -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-      -1, -1, -1, -1};
+    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, 62, -1, -1, -1, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60,
+    61, -1, -1, -1, -1, -1, -1, -1, 0,  1,  2,  3,  4,  5,  6,  7,  8,  9,  10,
+    11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1,
+    -1, -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42,
+    43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1, -1};
   uint8_t *o;
   const uint8_t *p, *end;
   uint32_t n;
@@ -1478,7 +1748,7 @@ fin:
   dest->len = (size_t)(o - dest->base);
 }
 
-void sf_pctdecode(sf_vec *dest, const sf_vec *src) {
+void sfparse_pctdecode(sfparse_vec *dest, const sfparse_vec *src) {
   const uint8_t *p, *q;
   uint8_t *o;
   size_t len, slen;
diff --git a/deps/ngtcp2/nghttp3/lib/sfparse/sfparse.h b/deps/ngtcp2/nghttp3/lib/sfparse/sfparse.h
index 01cc947d4d6..9341221a099 100644
--- a/deps/ngtcp2/nghttp3/lib/sfparse/sfparse.h
+++ b/deps/ngtcp2/nghttp3/lib/sfparse/sfparse.h
@@ -31,90 +31,90 @@
    libcurl) */
 #if (defined(_WIN32) || defined(__WIN32__)) && !defined(WIN32)
 #  define WIN32
-#endif
+#endif /* (defined(_WIN32) || defined(__WIN32__)) && !defined(WIN32) */
 
 #ifdef __cplusplus
 extern "C" {
-#endif
+#endif /* defined(__cplusplus) */
 
 #if defined(_MSC_VER) && (_MSC_VER < 1800)
 /* MSVC < 2013 does not have inttypes.h because it is not C99
    compliant.  See compiler macros and version number in
    https://sourceforge.net/p/predef/wiki/Compilers/ */
 #  include <stdint.h>
-#else /* !defined(_MSC_VER) || (_MSC_VER >= 1800) */
+#else /* !(defined(_MSC_VER) && (_MSC_VER < 1800)) */
 #  include <inttypes.h>
-#endif /* !defined(_MSC_VER) || (_MSC_VER >= 1800) */
+#endif /* !(defined(_MSC_VER) && (_MSC_VER < 1800)) */
 #include <sys/types.h>
 #include <stddef.h>
 
 /**
  * @enum
  *
- * :type:`sf_type` defines value type.
+ * :type:`sfparse_type` defines value type.
  */
-typedef enum sf_type {
+typedef enum sfparse_type {
   /**
-   * :enum:`SF_TYPE_BOOLEAN` indicates boolean type.
+   * :enum:`SFPARSE_TYPE_BOOLEAN` indicates boolean type.
    */
-  SF_TYPE_BOOLEAN,
+  SFPARSE_TYPE_BOOLEAN,
   /**
-   * :enum:`SF_TYPE_INTEGER` indicates integer type.
+   * :enum:`SFPARSE_TYPE_INTEGER` indicates integer type.
    */
-  SF_TYPE_INTEGER,
+  SFPARSE_TYPE_INTEGER,
   /**
-   * :enum:`SF_TYPE_DECIMAL` indicates decimal type.
+   * :enum:`SFPARSE_TYPE_DECIMAL` indicates decimal type.
    */
-  SF_TYPE_DECIMAL,
+  SFPARSE_TYPE_DECIMAL,
   /**
-   * :enum:`SF_TYPE_STRING` indicates string type.
+   * :enum:`SFPARSE_TYPE_STRING` indicates string type.
    */
-  SF_TYPE_STRING,
+  SFPARSE_TYPE_STRING,
   /**
-   * :enum:`SF_TYPE_TOKEN` indicates token type.
+   * :enum:`SFPARSE_TYPE_TOKEN` indicates token type.
    */
-  SF_TYPE_TOKEN,
+  SFPARSE_TYPE_TOKEN,
   /**
-   * :enum:`SF_TYPE_BYTESEQ` indicates byte sequence type.
+   * :enum:`SFPARSE_TYPE_BYTESEQ` indicates byte sequence type.
    */
-  SF_TYPE_BYTESEQ,
+  SFPARSE_TYPE_BYTESEQ,
   /**
-   * :enum:`SF_TYPE_INNER_LIST` indicates inner list type.
+   * :enum:`SFPARSE_TYPE_INNER_LIST` indicates inner list type.
    */
-  SF_TYPE_INNER_LIST,
+  SFPARSE_TYPE_INNER_LIST,
   /**
-   * :enum:`SF_TYPE_DATE` indicates date type.
+   * :enum:`SFPARSE_TYPE_DATE` indicates date type.
    */
-  SF_TYPE_DATE,
+  SFPARSE_TYPE_DATE,
   /**
-   * :enum:`SF_TYPE_DISPSTRING` indicates display string type.
+   * :enum:`SFPARSE_TYPE_DISPSTRING` indicates display string type.
    */
-  SF_TYPE_DISPSTRING
-} sf_type;
+  SFPARSE_TYPE_DISPSTRING
+} sfparse_type;
 
 /**
  * @macro
  *
- * :macro:`SF_ERR_PARSE_ERROR` indicates fatal parse error has
+ * :macro:`SFPARSE_ERR_PARSE` indicates fatal parse error has
  * occurred, and it is not possible to continue the processing.
  */
-#define SF_ERR_PARSE_ERROR -1
+#define SFPARSE_ERR_PARSE -1
 
 /**
  * @macro
  *
- * :macro:`SF_ERR_EOF` indicates that there is nothing left to read.
- * The context of this error varies depending on the function that
- * returns this error code.
+ * :macro:`SFPARSE_ERR_EOF` indicates that there is nothing left to
+ * read.  The context of this error varies depending on the function
+ * that returns this error code.
  */
-#define SF_ERR_EOF -2
+#define SFPARSE_ERR_EOF -2
 
 /**
  * @struct
  *
- * :type:`sf_vec` stores sequence of bytes.
+ * :type:`sfparse_vec` stores sequence of bytes.
  */
-typedef struct sf_vec {
+typedef struct sfparse_vec {
   /**
    * :member:`base` points to the beginning of the sequence of bytes.
    */
@@ -123,29 +123,29 @@ typedef struct sf_vec {
    * :member:`len` is the number of bytes contained in this sequence.
    */
   size_t len;
-} sf_vec;
+} sfparse_vec;
 
 /**
  * @macro
  *
- * :macro:`SF_VALUE_FLAG_NONE` indicates no flag set.
+ * :macro:`SFPARSE_VALUE_FLAG_NONE` indicates no flag set.
  */
-#define SF_VALUE_FLAG_NONE 0x0u
+#define SFPARSE_VALUE_FLAG_NONE 0x0u
 
 /**
  * @macro
  *
- * :macro:`SF_VALUE_FLAG_ESCAPED_STRING` indicates that a string
+ * :macro:`SFPARSE_VALUE_FLAG_ESCAPED_STRING` indicates that a string
  * contains escaped character(s).
  */
-#define SF_VALUE_FLAG_ESCAPED_STRING 0x1u
+#define SFPARSE_VALUE_FLAG_ESCAPED_STRING 0x1u
 
 /**
  * @struct
  *
- * :type:`sf_decimal` contains decimal value.
+ * :type:`sfparse_decimal` contains decimal value.
  */
-typedef struct sf_decimal {
+typedef struct sfparse_decimal {
   /**
    * :member:`numer` contains numerator of the decimal value.
    */
@@ -154,275 +154,289 @@ typedef struct sf_decimal {
    * :member:`denom` contains denominator of the decimal value.
    */
   int64_t denom;
-} sf_decimal;
+} sfparse_decimal;
 
 /**
  * @struct
  *
- * :type:`sf_value` stores a Structured Field item.  For Inner List,
- * only type is set to :enum:`sf_type.SF_TYPE_INNER_LIST`.  In order
- * to read the items contained in an inner list, call
- * `sf_parser_inner_list`.
+ * :type:`sfparse_value` stores a Structured Field item.  For Inner
+ * List, only type is set to
+ * :enum:`sfparse_type.SFPARSE_TYPE_INNER_LIST`.  In order to read the
+ * items contained in an inner list, call `sfparse_parser_inner_list`.
  */
-typedef struct sf_value {
+typedef struct sfparse_value {
   /**
    * :member:`type` is the type of the value contained in this
    * particular object.
    */
-  sf_type type;
+  sfparse_type type;
   /**
    * :member:`flags` is bitwise OR of one or more of
-   * :macro:`SF_VALUE_FLAG_* <SF_VALUE_FLAG_NONE>`.
+   * :macro:`SFPARSE_VALUE_FLAG_* <SFPARSE_VALUE_FLAG_NONE>`.
    */
   uint32_t flags;
   /**
    * @anonunion_start
    *
-   * @sf_value_value
+   * @sfparse_value_value
    */
   union {
     /**
      * :member:`boolean` contains boolean value if :member:`type` ==
-     * :enum:`sf_type.SF_TYPE_BOOLEAN`.  1 indicates true, and 0
-     * indicates false.
+     * :enum:`sfparse_type.SFPARSE_TYPE_BOOLEAN`.  1 indicates true,
+     * and 0 indicates false.
      */
     int boolean;
     /**
      * :member:`integer` contains integer value if :member:`type` is
-     * either :enum:`sf_type.SF_TYPE_INTEGER` or
-     * :enum:`sf_type.SF_TYPE_DATE`.
+     * either :enum:`sfparse_type.SFPARSE_TYPE_INTEGER` or
+     * :enum:`sfparse_type.SFPARSE_TYPE_DATE`.
      */
     int64_t integer;
     /**
      * :member:`decimal` contains decimal value if :member:`type` ==
-     * :enum:`sf_type.SF_TYPE_DECIMAL`.
+     * :enum:`sfparse_type.SFPARSE_TYPE_DECIMAL`.
      */
-    sf_decimal decimal;
+    sfparse_decimal decimal;
     /**
      * :member:`vec` contains sequence of bytes if :member:`type` is
-     * either :enum:`sf_type.SF_TYPE_STRING`,
-     * :enum:`sf_type.SF_TYPE_TOKEN`, :enum:`sf_type.SF_TYPE_BYTESEQ`,
-     * or :enum:`sf_type.SF_TYPE_DISPSTRING`.
+     * either :enum:`sfparse_type.SFPARSE_TYPE_STRING`,
+     * :enum:`sfparse_type.SFPARSE_TYPE_TOKEN`,
+     * :enum:`sfparse_type.SFPARSE_TYPE_BYTESEQ`, or
+     * :enum:`sfparse_type.SFPARSE_TYPE_DISPSTRING`.
      *
-     * For :enum:`sf_type.SF_TYPE_STRING`, this field contains one or
-     * more escaped characters if :member:`flags` has
-     * :macro:`SF_VALUE_FLAG_ESCAPED_STRING` set.  To unescape the
-     * string, use `sf_unescape`.
+     * For :enum:`sfparse_type.SFPARSE_TYPE_STRING`, this field
+     * contains one or more escaped characters if :member:`flags` has
+     * :macro:`SFPARSE_VALUE_FLAG_ESCAPED_STRING` set.  To unescape
+     * the string, use `sfparse_unescape`.
      *
-     * For :enum:`sf_type.SF_TYPE_BYTESEQ`, this field contains base64
-     * encoded string.  To decode this byte string, use
-     * `sf_base64decode`.
+     * For :enum:`sfparse_type.SFPARSE_TYPE_BYTESEQ`, this field
+     * contains base64 encoded string.  To decode this byte string,
+     * use `sfparse_base64decode`.
      *
-     * For :enum:`sf_type.SF_TYPE_DISPSTRING`, this field may contain
-     * percent-encoded UTF-8 byte sequences.  To decode it, use
-     * `sf_pctdecode`.
+     * For :enum:`sfparse_type.SFPARSE_TYPE_DISPSTRING`, this field
+     * may contain percent-encoded UTF-8 byte sequences.  To decode
+     * it, use `sfparse_pctdecode`.
      *
-     * If :member:`vec.len <sf_vec.len>` == 0, :member:`vec.base
-     * <sf_vec.base>` is guaranteed to be NULL.
+     * If :member:`vec.len <sfparse_vec.len>` == 0, :member:`vec.base
+     * <sfparse_vec.base>` is guaranteed to be NULL.
      */
-    sf_vec vec;
+    sfparse_vec vec;
     /**
      * @anonunion_end
      */
   };
-} sf_value;
+} sfparse_value;
 
 /**
  * @struct
  *
- * :type:`sf_parser` is the Structured Field Values parser.  Use
- * `sf_parser_init` to initialize it.
+ * :type:`sfparse_parser` is the Structured Field Values parser.  Use
+ * `sfparse_parser_init` to initialize it.
  */
-typedef struct sf_parser {
+typedef struct sfparse_parser {
   /* all fields are private */
   const uint8_t *pos;
   const uint8_t *end;
   uint32_t state;
-} sf_parser;
+} sfparse_parser;
 
 /**
  * @function
  *
- * `sf_parser_init` initializes |sfp| with the given buffer pointed by
- * |data| of length |datalen|.
+ * `sfparse_parser_init` initializes |sfp| with the given data encoded
+ * in Structured Field Values pointed by |data| of length |datalen|.
  */
-void sf_parser_init(sf_parser *sfp, const uint8_t *data, size_t datalen);
+void sfparse_parser_init(sfparse_parser *sfp, const uint8_t *data,
+                         size_t datalen);
 
 /**
  * @function
  *
- * `sf_parser_param` reads a parameter.  If this function returns 0,
- * it stores parameter key and value in |dest_key| and |dest_value|
+ * `sfparse_parser_param` reads a parameter.  If this function returns
+ * 0, it stores parameter key and value in |dest_key| and |dest_value|
  * respectively, if they are not NULL.
  *
  * This function does no effort to find duplicated keys.  Same key may
  * be reported more than once.
  *
  * Caller should keep calling this function until it returns negative
- * error code.  If it returns :macro:`SF_ERR_EOF`, all parameters have
- * read, and caller can continue to read rest of the values.  If it
- * returns :macro:`SF_ERR_PARSE_ERROR`, it encountered fatal error
+ * error code.  If it returns :macro:`SFPARSE_ERR_EOF`, all parameters
+ * have read, and caller can continue to read rest of the values.  If
+ * it returns :macro:`SFPARSE_ERR_PARSE`, it encountered fatal error
  * while parsing field value.
  */
-int sf_parser_param(sf_parser *sfp, sf_vec *dest_key, sf_value *dest_value);
+int sfparse_parser_param(sfparse_parser *sfp, sfparse_vec *dest_key,
+                         sfparse_value *dest_value);
 
 /**
  * @function
  *
- * `sf_parser_dict` reads the next dictionary key and value pair.  If
- * this function returns 0, it stores the key and value in |dest_key|
- * and |dest_value| respectively, if they are not NULL.
+ * `sfparse_parser_dict` reads the next dictionary key and value pair.
+ * If this function returns 0, it stores the key and value in
+ * |dest_key| and |dest_value| respectively, if they are not NULL.
  *
  * Caller can optionally read parameters attached to the pair by
- * calling `sf_parser_param`.
+ * calling `sfparse_parser_param`.
  *
  * This function does no effort to find duplicated keys.  Same key may
  * be reported more than once.
  *
  * Caller should keep calling this function until it returns negative
- * error code.  If it returns :macro:`SF_ERR_EOF`, all key and value
- * pairs have been read, and there is nothing left to read.
+ * error code.  If it returns :macro:`SFPARSE_ERR_EOF`, all key and
+ * value pairs have been read, and there is nothing left to read.
  *
  * This function returns 0 if it succeeds, or one of the following
  * negative error codes:
  *
- * :macro:`SF_ERR_EOF`
+ * :macro:`SFPARSE_ERR_EOF`
  *     All values in the dictionary have read.
- * :macro:`SF_ERR_PARSE_ERROR`
+ * :macro:`SFPARSE_ERR_PARSE`
  *     It encountered fatal error while parsing field value.
  */
-int sf_parser_dict(sf_parser *sfp, sf_vec *dest_key, sf_value *dest_value);
+int sfparse_parser_dict(sfparse_parser *sfp, sfparse_vec *dest_key,
+                        sfparse_value *dest_value);
 
 /**
  * @function
  *
- * `sf_parser_list` reads the next list item.  If this function
+ * `sfparse_parser_list` reads the next list item.  If this function
  * returns 0, it stores the item in |dest| if it is not NULL.
  *
  * Caller can optionally read parameters attached to the item by
- * calling `sf_parser_param`.
+ * calling `sfparse_parser_param`.
  *
  * Caller should keep calling this function until it returns negative
- * error code.  If it returns :macro:`SF_ERR_EOF`, all values in the
- * list have been read, and there is nothing left to read.
+ * error code.  If it returns :macro:`SFPARSE_ERR_EOF`, all values in
+ * the list have been read, and there is nothing left to read.
  *
  * This function returns 0 if it succeeds, or one of the following
  * negative error codes:
  *
- * :macro:`SF_ERR_EOF`
+ * :macro:`SFPARSE_ERR_EOF`
  *     All values in the list have read.
- * :macro:`SF_ERR_PARSE_ERROR`
+ * :macro:`SFPARSE_ERR_PARSE`
  *     It encountered fatal error while parsing field value.
  */
-int sf_parser_list(sf_parser *sfp, sf_value *dest);
+int sfparse_parser_list(sfparse_parser *sfp, sfparse_value *dest);
 
 /**
  * @function
  *
- * `sf_parser_item` reads a single item.  If this function returns 0,
- * it stores the item in |dest| if it is not NULL.
+ * `sfparse_parser_item` reads a single item.  If this function
+ * returns 0, it stores the item in |dest| if it is not NULL.
  *
  * This function is only used for the field value that consists of a
  * single item.
  *
  * Caller can optionally read parameters attached to the item by
- * calling `sf_parser_param`.
+ * calling `sfparse_parser_param`.
  *
  * Caller should call this function again to make sure that there is
  * nothing left to read.  If this 2nd function call returns
- * :macro:`SF_ERR_EOF`, all data have been processed successfully.
+ * :macro:`SFPARSE_ERR_EOF`, all data have been processed
+ * successfully.
  *
  * This function returns 0 if it succeeds, or one of the following
  * negative error codes:
  *
- * :macro:`SF_ERR_EOF`
+ * :macro:`SFPARSE_ERR_EOF`
  *     There is nothing left to read.
- * :macro:`SF_ERR_PARSE_ERROR`
+ * :macro:`SFPARSE_ERR_PARSE`
  *     It encountered fatal error while parsing field value.
  */
-int sf_parser_item(sf_parser *sfp, sf_value *dest);
+int sfparse_parser_item(sfparse_parser *sfp, sfparse_value *dest);
 
 /**
  * @function
  *
- * `sf_parser_inner_list` reads the next inner list item.  If this
- * function returns 0, it stores the item in |dest| if it is not NULL.
+ * `sfparse_parser_inner_list` reads the next inner list item.  If
+ * this function returns 0, it stores the item in |dest| if it is not
+ * NULL.
  *
  * Caller can optionally read parameters attached to the item by
- * calling `sf_parser_param`.
+ * calling `sfparse_parser_param`.
  *
  * Caller should keep calling this function until it returns negative
- * error code.  If it returns :macro:`SF_ERR_EOF`, all values in this
- * inner list have been read, and caller can optionally read
+ * error code.  If it returns :macro:`SFPARSE_ERR_EOF`, all values in
+ * this inner list have been read, and caller can optionally read
  * parameters attached to this inner list by calling
- * `sf_parser_param`.  Then caller can continue to read rest of the
- * values.
+ * `sfparse_parser_param`.  Then caller can continue to read rest of
+ * the values.
  *
  * This function returns 0 if it succeeds, or one of the following
  * negative error codes:
  *
- * :macro:`SF_ERR_EOF`
+ * :macro:`SFPARSE_ERR_EOF`
  *     All values in the inner list have read.
- * :macro:`SF_ERR_PARSE_ERROR`
+ * :macro:`SFPARSE_ERR_PARSE`
  *     It encountered fatal error while parsing field value.
  */
-int sf_parser_inner_list(sf_parser *sfp, sf_value *dest);
+int sfparse_parser_inner_list(sfparse_parser *sfp, sfparse_value *dest);
 
 /**
  * @function
  *
- * `sf_unescape` copies |src| to |dest| by removing escapes (``\``).
- * |src| should be the pointer to :member:`sf_value.vec` of type
- * :enum:`sf_type.SF_TYPE_STRING` produced by either `sf_parser_dict`,
- * `sf_parser_list`, `sf_parser_inner_list`, `sf_parser_item`, or
- * `sf_parser_param`, otherwise the behavior is undefined.
+ * `sfparse_unescape` copies |src| to |dest| by removing escapes
+ * (``\``).  |src| should be the pointer to
+ * :member:`sfparse_value.vec` of type
+ * :enum:`sfparse_type.SFPARSE_TYPE_STRING` produced by either
+ * `sfparse_parser_dict`, `sfparse_parser_list`,
+ * `sfparse_parser_inner_list`, `sfparse_parser_item`, or
+ * `sfparse_parser_param`, otherwise the behavior is undefined.
  *
- * :member:`dest->base <sf_vec.base>` must point to the buffer that
- * has sufficient space to store the unescaped string.
+ * :member:`dest->base <sfparse_vec.base>` must point to the buffer
+ * that has sufficient space to store the unescaped string.  The
+ * memory areas pointed by :member:`dest->base <sfparse_vec.base>` and
+ * :member:`src->base <sfparse_vec.base>` must not overlap.
  *
  * This function sets the length of unescaped string to
- * :member:`dest->len <sf_vec.len>`.
+ * :member:`dest->len <sfparse_vec.len>`.
  */
-void sf_unescape(sf_vec *dest, const sf_vec *src);
+void sfparse_unescape(sfparse_vec *dest, const sfparse_vec *src);
 
 /**
  * @function
  *
- * `sf_base64decode` decodes Base64 encoded string |src| and writes
+ * `sfparse_base64decode` decodes Base64 encoded string |src| and
+ * writes the result into |dest|.  |src| should be the pointer to
+ * :member:`sfparse_value.vec` of type
+ * :enum:`sfparse_type.SFPARSE_TYPE_BYTESEQ` produced by either
+ * `sfparse_parser_dict`, `sfparse_parser_list`,
+ * `sfparse_parser_inner_list`, `sfparse_parser_item`, or
+ * `sfparse_parser_param`, otherwise the behavior is undefined.
+ *
+ * :member:`dest->base <sfparse_vec.base>` must point to the buffer
+ * that has sufficient space to store the decoded byte string.
+ *
+ * This function sets the length of decoded byte string to
+ * :member:`dest->len <sfparse_vec.len>`.
+ */
+void sfparse_base64decode(sfparse_vec *dest, const sfparse_vec *src);
+
+/**
+ * @function
+ *
+ * `sfparse_pctdecode` decodes percent-encoded string |src| and writes
  * the result into |dest|.  |src| should be the pointer to
- * :member:`sf_value.vec` of type :enum:`sf_type.SF_TYPE_BYTESEQ`
- * produced by either `sf_parser_dict`, `sf_parser_list`,
- * `sf_parser_inner_list`, `sf_parser_item`, or `sf_parser_param`,
- * otherwise the behavior is undefined.
+ * :member:`sfparse_value.vec` of type
+ * :enum:`sfparse_type.SFPARSE_TYPE_DISPSTRING` produced by either
+ * `sfparse_parser_dict`, `sfparse_parser_list`,
+ * `sfparse_parser_inner_list`, `sfparse_parser_item`, or
+ * `sfparse_parser_param`, otherwise the behavior is undefined.
  *
- * :member:`dest->base <sf_vec.base>` must point to the buffer that
- * has sufficient space to store the decoded byte string.
+ * :member:`dest->base <sfparse_vec.base>` must point to the buffer
+ * that has sufficient space to store the decoded byte string.  The
+ * memory areas pointed by :member:`dest->base <sfparse_vec.base>` and
+ * :member:`src->base <sfparse_vec.base>` must not overlap.
  *
  * This function sets the length of decoded byte string to
- * :member:`dest->len <sf_vec.len>`.
+ * :member:`dest->len <sfparse_vec.len>`.
  */
-void sf_base64decode(sf_vec *dest, const sf_vec *src);
-
-/**
- * @function
- *
- * `sf_pctdecode` decodes percent-encoded string |src| and writes the
- * result into |dest|.  |src| should be the pointer to
- * :member:`sf_value.vec` of type :enum:`sf_type.SF_TYPE_DISPSTRING`
- * produced by either `sf_parser_dict`, `sf_parser_list`,
- * `sf_parser_inner_list`, `sf_parser_item`, or `sf_parser_param`,
- * otherwise the behavior is undefined.
- *
- * :member:`dest->base <sf_vec.base>` must point to the buffer that
- * has sufficient space to store the decoded byte string.
- *
- * This function sets the length of decoded byte string to
- * :member:`dest->len <sf_vec.len>`.
- */
-void sf_pctdecode(sf_vec *dest, const sf_vec *src);
+void sfparse_pctdecode(sfparse_vec *dest, const sfparse_vec *src);
 
 #ifdef __cplusplus
 }
-#endif
+#endif /* defined(__cplusplus) */
 
-#endif /* SFPARSE_H */
+#endif /* !defined(SFPARSE_H) */