Small HTTP server fixes

runtime/bin/http_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.
 
 class _HttpHeaders implements HttpHeaders {
   _HttpHeaders() : _headers = new Map<String, List<String>>();
 
   List<String> operator[](String name) {
     name = name.toLowerCase();
     return _headers[name];
@@ skipping 1031 matching lines @@
     _writeSP();
     data = _statusCode.toString().charCodes();
     _httpConnection._write(data);
     _writeSP();
     data = reasonPhrase.charCodes();
     _httpConnection._write(data);
     _writeCRLF();
 
     // Determine the value of the "Transfer-Encoding" header based on
     // whether the content length is known.
-    if (_contentLength > 0) {
+    if (_contentLength >= 0) {
       _headers.set(HttpHeaders.CONTENT_LENGTH, _contentLength.toString());
     } else if (_contentLength < 0) {
       _headers.set(HttpHeaders.TRANSFER_ENCODING, "chunked");
     }
 
     // Add all the cookies set to the headers.
     if (_cookies != null) {
       _cookies.forEach((cookie) {
         _headers.add("set-cookie", cookie);
       });
@@ skipping 273 matching lines @@
     if (onRequestReceived != null) {
       onRequestReceived(_request, _response);
     }
   }
 
   void _onDataReceived(List<int> data) {
     _request._onDataReceived(data);
   }
 
   void _onDataEnd(bool close) {
-    if (_request != null) {
-      _request._onDataEnd();
-    }
-    _request = null;
+    _request._onDataEnd();
   }
 
   void _responseDone() {
     // If the connection is closing then close the output stream to
     // fully close the socket.
     if (_closing) {
       _socket.close();
     }
     _response = null;
   }
@@ skipping 96 matching lines @@
           }
         }
         return;
       }
     }
 
     if (_defaultHandler != null) {
       _defaultHandler(request, response);
     } else {
       response.statusCode = HttpStatus.NOT_FOUND;
-      if (request.protocolVersion == "1.0") {
-        response.contentLength = 0;
-      }
+      response.contentLength = 0;
       response.outputStream.close();
     }
   }
 
 
   ServerSocket _server;  // The server listen socket.
   bool _closeServer = false;
   Set<_HttpConnection> _connections;  // Set of currently connected clients.
   List<_RequestHandlerRegistration> _handlers;
   Object _defaultHandler;
@@ skipping 622 matching lines @@
 
 
 class _RedirectInfo implements RedirectInfo {
   const _RedirectInfo(int this.statusCode,
                       String this.method,
                       Uri this.location);
   final int statusCode;
   final String method;
   final Uri location;
 }