Fix bug in HTTP client request generation

runtime/bin/websocket_impl.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.
 
 const String _webSocketGUID = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
 
 class _WebSocketMessageType {
   static const int NONE = 0;
   static const int BINARY = 1;
   static const int TEXT = 2;
@@ skipping 757 matching lines @@
 class _WebSocket implements WebSocket {
   _WebSocket(String url, [protocols]) {
     Uri uri = new Uri.fromString(url);
     if (uri.scheme != "ws") {
       throw new WebSocketException("Unsupported URL scheme ${uri.scheme}");
     }
     if (uri.userInfo != "") {
       throw new WebSocketException("Unsupported user info ${uri.userInfo}");
     }
     int port = uri.port == 0 ? HttpClient.DEFAULT_HTTP_PORT : uri.port;
-    String path;
+    String path = uri.path;
+    if (path.length == 0) path = "/";
     if (uri.query != "") {
       if (uri.fragment != "") {
-        path = "${uri.path}?${uri.query}#${uri.fragment}";
+        path = "${path}?${uri.query}#${uri.fragment}";
       } else {
-        path = "${uri.path}?${uri.query}";
+        path = "${path}?${uri.query}";
       }
-    } else {
-      path = uri.path;
     }
 
     HttpClient client = new HttpClient();
     HttpClientConnection conn = client.open("GET", uri.domain, port, path);
     if (protocols is String) protocols = [protocols];
     _wsconn = new WebSocketClientConnection(conn, protocols);
     _wsconn.onOpen = () {
       // HTTP client not needed after socket have been detached.
       client.shutdown();
       client = null;
@@ skipping 67 matching lines @@
 
 class _WebSocketCloseEvent implements CloseEvent {
   _WebSocketCloseEvent(this._wasClean, this._code, this._reason);
   bool get wasClean => _wasClean;
   int get code => _code;
   String get reason => _reason;
   bool _wasClean;
   int _code;
   String _reason;
 }