Fix a number of HTTP issues

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 612 matching lines @@
       _state = _State.FAILURE;
       // Report the error through the error callback if any. Otherwise
       // throw the error.
       error(
           new HttpParserException(
                 "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) {
+    // Don't report errors for a request parser when HTTP parser is in
+    // idle state. Clients can close the connection and cause a
+    // connection reset by peer error which is OK.
+    if (_requestParser && _state == _State.START) {
       closed();
       return;
     }
     error(e);
   }
 
   String get version {
     switch (_httpVersion) {
       case _HttpVersion.HTTP10:
         return "1.0";
       case _HttpVersion.HTTP11:
         return "1.1";
     }
     return null;
   }
 
   void cancel() {
     _state = _State.CANCELED;
   }
 
+  void restart() {
+    _reset();
+  }
+
   int get messageType => _messageType;
   int get contentLength => _contentLength;
   bool get upgrade => _connectionUpgrade && _state == _State.UPGRADED;
   bool get persistentConnection => _persistentConnection;
 
   void set responseToMethod(String method) { _responseToMethod = method; }
 
   List<int> readUnparsedData() {
     if (_buffer == null) return [];
     if (_index == _lastIndex) return [];
@@ skipping 114 matching lines @@
   Function error;
   Function closed;
 }
 
 
 class HttpParserException implements Exception {
   const HttpParserException([String this.message = ""]);
   String toString() => "HttpParserException: $message";
   final String message;
 }