Improve the handling of the connection header

runtime/bin/http.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.
 
 /**
  * HTTP status codes.
  */
 interface HttpStatus {
   static final int CONTINUE = 100;
   static final int SWITCHING_PROTOCOLS = 101;
@@ skipping 288 matching lines @@
  * Http request delivered to the HTTP server callback.
  */
 interface HttpRequest default _HttpRequest {
   /**
    * Returns the content length of the request body. If the size of
    * the request body is not known in advance this -1.
    */
   int get contentLength();
 
   /**
+   * Returns the persistent connection state signaled by the client.
+   */
+  bool get persistentConnection();
+
+  /**
    * Returns the method for the request.
    */
   String get method();
 
   /**
    * Returns the URI for the request.
    */
   String get uri();
 
   /**
@@ skipping 42 matching lines @@
    */
   int statusCode;
 
   /**
    * Gets and sets the reason phrase. If no reason phrase is explicitly
    * set a default reason phrase is provided.
    */
   String reasonPhrase;
 
   /**
+   * Gets and sets the persistent connection state. The initial value
+   * of this property is the persistent connection state from the
+   * request.
+   */
+  bool persistentConnection;
+
+  /**
    * Returns the response headers.
    */
   HttpHeaders get headers();
 
   /**
    * Returns the output stream for the response. This is used to write
    * the response data. When all response data has been written close
    * the stream to indicate the end of the response.
    *
    * When this is accessed for the first time the response header is
@@ skipping 167 matching lines @@
    */
   InputStream get inputStream();
 }
 
 
 class HttpException implements Exception {
   const HttpException([String this.message = ""]);
   String toString() => "HttpException: $message";
   final String message;
 }