Change the error handling in dart:io

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 99 matching lines @@
   /**
    * Returns the port that the server is listening on. This can be
    * used to get the actual port used when a value of 0 for [port] is
    * specified in the [listen] call.
    */
   int get port();
 
   /**
    * Sets the error handler that is called when a connection error occurs.
    */
-  void set onError(void callback(Exception e));
+  void set onError(void callback(e));
 }
 
 
 /**
  * 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.
@@ skipping 339 matching lines @@
    * the response is ready for processing. The callback is called when
    * all headers of the response are received and data is ready to be
    * received.
    */
   void set onResponse(void callback(HttpClientResponse response));
 
   /**
    * Sets the handler that gets called if an error occurs while
    * connecting or processing the HTTP request.
    */
-  void set onError(void callback(Exception e));
+  void set onError(void callback(e));
 }
 
 
 /**
  * HTTP request for a client connection.
  */
 interface HttpClientRequest default _HttpClientRequest {
   /**
    * Gets and sets the content length of the request. If the size of
    * the request is not known in advance set content length to -1,
@@ skipping 50 matching lines @@
    */
   InputStream get inputStream();
 }
 
 
 class HttpException implements Exception {
   const HttpException([String this.message = ""]);
   String toString() => "HttpException: $message";
   final String message;
 }