Generate an error for active connections when the HTTP client is shutdown

sdk/lib/io/http_parser.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // Global constants.
 class _Const {
   // Bytes for "HTTP".
   static const HTTP = const [72, 84, 84, 80];
   // Bytes for "HTTP/1.".
   static const HTTP1DOT = const [72, 84, 84, 80, 47, 49, 46];
@@ skipping 564 matching lines @@
 
   void streamData(List<int> buffer) {
     assert(_buffer == null);
     _buffer = buffer;
     _index = 0;
     _lastIndex = buffer.length;
     _parse();
   }
 
   void streamDone() {
+    String type() => _requestParser ? "request" : "response";
+
     // If the connection is idle the HTTP stream is closed.
     if (_state == _State.START) {
       if (_requestParser) {
         closed();
       } else {
         error(
             new HttpParserException(
-                "Connection closed before full header was received"));
+                "Connection closed before full ${type()} header was received"));
       }
       return;
     }
 
     if (_state < _State.FIRST_BODY_STATE) {
       _state = _State.FAILURE;
       // Report the error through the error callback if any. Otherwise
       // throw the error.
       error(
           new HttpParserException(
-              "Connection closed before full header was received"));
+                "Connection closed before full ${type()} header was received"));
       return;
     }
 
     if (!_chunked && _contentLength == -1) {
       dataEnd(true);
       _state = _State.CLOSED;
       closed();
     } else {
       _state = _State.FAILURE;
       // Report the error through the error callback if any. Otherwise
       // throw the error.
       error(
           new HttpParserException(
-              "Connection closed before full body was received"));
+                "Connection closed before full ${type()} body was received"));
     }
   }
 
   void streamError(e) {
     // Don't report errors when HTTP parser is in idle state. Clients
     // can close the connection and cause a connection reset by peer
     // error which is OK.
     if (_state == _State.START) {
       closed();
       return;
@@ skipping 138 matching lines @@
   Function error;
   Function closed;
 }
 
 
 class HttpParserException implements Exception {
   const HttpParserException([String this.message = ""]);
   String toString() => "HttpParserException: $message";
   final String message;
 }