diff --git a/lib/bindings/http/binary_0_1.js b/lib/bindings/http/binary_0_1.js
index 076022a..4bca1a5 100644
--- a/lib/bindings/http/binary_0_1.js
+++ b/lib/bindings/http/binary_0_1.js
@@ -16,25 +16,40 @@ HTTPBinary.prototype.emit = function(cloudevent){
   // Always set stuff in _config
   var _headers = _config["headers"];
 
+  // OPTIONAL CONTENT TYPE ATTRIBUTE
   if(cloudevent.getContenttype()) {
     _headers["Content-Type"] = cloudevent.getContenttype();
   }
 
+  // REQUIRED ATTRIBUTES
   _headers["CE-EventType"] = cloudevent.getType();
-  if(cloudevent.getEventTypeVersion()) {
-    _headers["CE-EventTypeVersion"] = cloudevent.getEventTypeVersion();
-  }
   _headers["CE-CloudEventsVersion"] = cloudevent.getSpecversion();
   _headers["CE-Source"] = cloudevent.getSource();
   _headers["CE-EventID"] = cloudevent.getId();
+
+  // OPTIONAL ATTRIBUTES
+  if(cloudevent.getEventTypeVersion()) {
+    _headers["CE-EventTypeVersion"] = cloudevent.getEventTypeVersion();
+  }
   if(cloudevent.getTime()) {
     _headers["CE-EventTime"] = cloudevent.getTime();
   }
-  _headers["CE-SchemaURL"] = cloudevent.getSchemaurl();
+  if(cloudevent.getSchemaurl()) {
+    _headers["CE-SchemaURL"] = cloudevent.getSchemaurl();
+  }
 
   // Set the cloudevent payload
   _config["data"] = cloudevent.format().data;
 
+  // EXTENSION CONTEXT ATTRIBUTES
+  var exts = cloudevent.getExtensions();
+  for(var ext in exts){
+    if({}.hasOwnProperty.call(exts, ext)){
+      let capsExt = ext.charAt(0).toUpperCase() + ext.slice(1)
+      _headers["CE-X-" + capsExt] = exts[ext];
+    }
+  }
+
   // Return the Promise
   return axios.request(_config);
 };
diff --git a/lib/bindings/http/binary_0_2.js b/lib/bindings/http/binary_0_2.js
index f4d6de1..916d538 100644
--- a/lib/bindings/http/binary_0_2.js
+++ b/lib/bindings/http/binary_0_2.js
@@ -17,21 +17,29 @@ HTTPBinary.prototype.emit = function(cloudevent){
   // Always set stuff in _config
   var _headers = _config["headers"];
 
-  _headers["Content-Type"] = cloudevent.getContenttype();
+  // OPTIONAL CONTENT TYPE ATTRIBUTE
+  if (cloudevent.getContenttype()) {
+    _headers["Content-Type"] = cloudevent.getContenttype();
+  }
 
+  // REQUIRED ATTRIBUTES
   _headers["ce-type"] = cloudevent.getType();
   _headers["ce-specversion"] = cloudevent.getSpecversion();
   _headers["ce-source"] = cloudevent.getSource();
   _headers["ce-id"] = cloudevent.getId();
-  if(cloudevent.getTime()) {
+
+  // OPTIONAL ATTRIBUTES
+  if (cloudevent.getTime()) {
     _headers["ce-time"] = cloudevent.getTime();
   }
-  _headers["ce-schemaurl"] = cloudevent.getSchemaurl();
+  if (cloudevent.getSchemaurl()) {
+    _headers["ce-schemaurl"] = cloudevent.getSchemaurl();
+  }
 
   // Set the cloudevent payload
   _config["data"] = cloudevent.format().data;
 
-  // Have extensions?
+  // EXTENSION CONTEXT ATTRIBUTES
   var exts = cloudevent.getExtensions(); 
   for(var ext in exts){
     if({}.hasOwnProperty.call(exts, ext)){