diff --git a/analysis_options.yaml b/analysis_options.yaml
index ddb7c9b..01c74eb 100644
--- a/analysis_options.yaml
+++ b/analysis_options.yaml
@@ -18,3 +18,4 @@ linter:
     - prefer_single_quotes
     - test_types_in_equals
     - use_super_parameters
+    - prefer_relative_imports
diff --git a/example/grpc-web/lib/app.dart b/example/grpc-web/lib/app.dart
index 48196f9..bdc920f 100644
--- a/example/grpc-web/lib/app.dart
+++ b/example/grpc-web/lib/app.dart
@@ -1,7 +1,7 @@
 import 'dart:async';
 import 'dart:html';
 
-import 'package:grpc_web/src/generated/echo.pbgrpc.dart';
+import 'src/generated/echo.pbgrpc.dart';
 
 class EchoApp {
   final EchoServiceClient _service;
diff --git a/lib/grpc.dart b/lib/grpc.dart
index e56f3c2..5f79523 100644
--- a/lib/grpc.dart
+++ b/lib/grpc.dart
@@ -36,6 +36,7 @@ export 'src/client/options.dart'
         BackoffStrategy,
         defaultBackoffStrategy,
         ChannelOptions;
+export 'src/client/proxy.dart' show Proxy;
 export 'src/client/transport/http2_credentials.dart'
     show BadCertificateHandler, allowBadCertificates, ChannelCredentials;
 
diff --git a/lib/src/auth/auth_io.dart b/lib/src/auth/auth_io.dart
index e8368b2..681ee59 100644
--- a/lib/src/auth/auth_io.dart
+++ b/lib/src/auth/auth_io.dart
@@ -1,3 +1,18 @@
+// Copyright (c) 2023, the gRPC project authors. Please see the AUTHORS file
+// for details. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 import 'dart:convert';
 import 'dart:io';
 
diff --git a/lib/src/client/client_keepalive.dart b/lib/src/client/client_keepalive.dart
index 9dcd54e..c088e59 100644
--- a/lib/src/client/client_keepalive.dart
+++ b/lib/src/client/client_keepalive.dart
@@ -1,3 +1,18 @@
+// Copyright (c) 2023, the gRPC project authors. Please see the AUTHORS file
+// for details. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 import 'dart:async';
 
 import 'package:clock/clock.dart';
diff --git a/lib/src/client/client_transport_connector.dart b/lib/src/client/client_transport_connector.dart
index 08bfa03..3d2a982 100644
--- a/lib/src/client/client_transport_connector.dart
+++ b/lib/src/client/client_transport_connector.dart
@@ -1,3 +1,18 @@
+// Copyright (c) 2023, the gRPC project authors. Please see the AUTHORS file
+// for details. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 import 'dart:async';
 
 import 'package:http2/transport.dart';
diff --git a/lib/src/client/http2_connection.dart b/lib/src/client/http2_connection.dart
index 77cab5e..998410a 100644
--- a/lib/src/client/http2_connection.dart
+++ b/lib/src/client/http2_connection.dart
@@ -18,7 +18,6 @@ import 'dart:convert';
 import 'dart:io';
 import 'dart:typed_data';
 
-import 'package:grpc/src/client/proxy.dart';
 import 'package:http2/transport.dart';
 
 import '../shared/codec.dart';
@@ -29,6 +28,7 @@ import 'client_transport_connector.dart';
 import 'connection.dart' hide ClientConnection;
 import 'connection.dart' as connection;
 import 'options.dart';
+import 'proxy.dart';
 import 'transport/http2_credentials.dart';
 import 'transport/http2_transport.dart';
 import 'transport/transport.dart';
diff --git a/lib/src/client/interceptor.dart b/lib/src/client/interceptor.dart
index 131105b..5318725 100644
--- a/lib/src/client/interceptor.dart
+++ b/lib/src/client/interceptor.dart
@@ -1,3 +1,18 @@
+// Copyright (c) 2023, the gRPC project authors. Please see the AUTHORS file
+// for details. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 import 'call.dart';
 import 'common.dart';
 import 'method.dart';
diff --git a/lib/src/client/proxy.dart b/lib/src/client/proxy.dart
index b4f889c..14d0f8d 100644
--- a/lib/src/client/proxy.dart
+++ b/lib/src/client/proxy.dart
@@ -1,3 +1,19 @@
+// Copyright (c) 2023, the gRPC project authors. Please see the AUTHORS file
+// for details. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/// Proxy data class with optional authentication.
 class Proxy {
   final String host;
   final int port;
diff --git a/lib/src/server/interceptor.dart b/lib/src/server/interceptor.dart
index ee9286c..81060f9 100644
--- a/lib/src/server/interceptor.dart
+++ b/lib/src/server/interceptor.dart
@@ -1,3 +1,18 @@
+// Copyright (c) 2023, the gRPC project authors. Please see the AUTHORS file
+// for details. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 import 'dart:async';
 
 import '../shared/status.dart';
diff --git a/lib/src/server/server_keepalive.dart b/lib/src/server/server_keepalive.dart
index 6bf6f8d..890e0fe 100644
--- a/lib/src/server/server_keepalive.dart
+++ b/lib/src/server/server_keepalive.dart
@@ -1,3 +1,18 @@
+// Copyright (c) 2023, the gRPC project authors. Please see the AUTHORS file
+// for details. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 import 'package:clock/clock.dart';
 
 /// Options to configure a gRPC server for receiving keepalive signals.
diff --git a/test/proxy_secure_test.dart b/test/proxy_secure_test.dart
index 6afb9b2..24f6ff8 100644
--- a/test/proxy_secure_test.dart
+++ b/test/proxy_secure_test.dart
@@ -3,7 +3,6 @@ import 'dart:async';
 import 'dart:io';
 
 import 'package:grpc/grpc.dart';
-import 'package:grpc/src/client/proxy.dart';
 import 'package:test/test.dart';
 
 import 'src/generated/echo.pbgrpc.dart';
diff --git a/test/proxy_test.dart b/test/proxy_test.dart
index 4cb6e8b..a4f9bcf 100644
--- a/test/proxy_test.dart
+++ b/test/proxy_test.dart
@@ -2,7 +2,6 @@
 import 'dart:async';
 
 import 'package:grpc/grpc.dart';
-import 'package:grpc/src/client/proxy.dart';
 import 'package:test/test.dart';
 
 import 'src/generated/echo.pbgrpc.dart';
diff --git a/test/src/client_utils.dart b/test/src/client_utils.dart
index 58d5b59..fd5cd38 100644
--- a/test/src/client_utils.dart
+++ b/test/src/client_utils.dart
@@ -19,7 +19,6 @@ import 'dart:convert';
 import 'package:grpc/grpc.dart';
 import 'package:grpc/src/client/channel.dart' as base;
 import 'package:grpc/src/client/http2_connection.dart';
-import 'package:grpc/src/client/proxy.dart';
 import 'package:grpc/src/shared/message.dart';
 import 'package:http2/transport.dart';
 import 'package:mockito/annotations.dart';
diff --git a/test/tools/http2_client.dart b/test/tools/http2_client.dart
index d124037..46b8b42 100644
--- a/test/tools/http2_client.dart
+++ b/test/tools/http2_client.dart
@@ -2,7 +2,6 @@ import 'dart:convert';
 
 import 'package:grpc/grpc.dart';
 import 'package:grpc/src/client/http2_connection.dart';
-import 'package:grpc/src/client/proxy.dart';
 import 'package:http2/http2.dart';
 
 Future<void> main(List<String> args) async {