Make HTTP server close sockets when closed in idle state

sdk/lib/io/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.
  */
 abstract class HttpStatus {
   static const int CONTINUE = 100;
   static const int SWITCHING_PROTOCOLS = 101;
@@ skipping 99 matching lines @@
   /**
    * Sets the error handler that is called when a connection error occurs.
    */
   void set onError(void callback(e));
 
   /**
    * Set the timeout, in seconds, for sessions of this HTTP server. Default
    * is 20 minutes.
    */
   set sessionTimeout(int timeout);
+
+  /**
+   * Returns a [:HttpConnectionsInfo:] object with an overview of the
+   * current connection handled by the server.
+   */
+  HttpConnectionsInfo connectionsInfo();
 }
 
 
+/**
+ * Overview information of the [:HttpServer:] socket connections.
+ */
+class HttpConnectionsInfo {
+  /**
+   * Total number of socket connections.
+   */
+  int total = 0;
+
+  /**
+   * Number of active connections where actual request/response
+   * processing is active.
+   */
+  int active = 0;
+
+  /**
+   * Number of idle connections held by clients as persistent connections.
+   */
+  int idle = 0;
+
+  /**
+   * Number of connections which are preparing to close. Note: These
+   * connections are also part of the [:active:] count as they might
+   * still be sending data to the client before finally closing.
+   */
+  int closing = 0;
+}
+
+
 /**
  * Access to the HTTP headers for requests and responses. In some
  * situations the headers will be imutable and the mutating methods
  * will then throw exceptions.
  *
  * For all operation on HTTP headers the header name is
  * case-insensitive.
  */
 abstract class HttpHeaders {
   static const ACCEPT = "Accept";
@@ skipping 917 matching lines @@
 class RedirectLimitExceededException extends RedirectException {
   const RedirectLimitExceededException(List<RedirectInfo> redirects)
       : super("Redirect limit exceeded", redirects);
 }
 
 
 class RedirectLoopException extends RedirectException {
   const RedirectLoopException(List<RedirectInfo> redirects)
       : super("Redirect loop detected", redirects);
 }