Rip out dart:io from pkg/http wherever possible.

pkg/http/lib/src/io_client.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.
 
 library io_client;
 
 import 'dart:async';
 import 'dart:io';
 
 import 'package:stack_trace/stack_trace.dart';
 
 import 'base_client.dart';
 import 'base_request.dart';
+import 'exception.dart';
 import 'streamed_response.dart';
 
 /// A `dart:io`-based HTTP client. This is the default client.
 class IOClient extends BaseClient {
   /// The underlying `dart:io` HTTP client.
   HttpClient _inner;
 
   /// Creates a new HTTP client.
   IOClient() : _inner = new HttpClient();
 
@@ skipping 16 matching lines @@
       return Chain.track(stream.pipe(ioRequest));
     }).then((response) {
       var headers = {};
       response.headers.forEach((key, values) {
         headers[key] = values.join(',');
       });
 
       var contentLength = response.contentLength == -1 ?
           null : response.contentLength;
       return new StreamedResponse(
-          response,
+          response.handleError((error) =>
+              throw new ClientException(error.message, error.uri),
+              test: (error) => error is HttpException),
           response.statusCode,
           contentLength: contentLength,
           request: request,
           headers: headers,
           isRedirect: response.isRedirect,
           persistentConnection: response.persistentConnection,
           reasonPhrase: response.reasonPhrase);
+    }).catchError((error) {
+      if (error is! HttpException) throw error;
+      throw new ClientException(error.message, error.uri);
     });
   }
 
   /// Closes the client. This terminates all active connections. If a client
   /// remains unclosed, the Dart process may not terminate.
   void close() {
     if (_inner != null) _inner.close(force: true);
     _inner = null;
   }
 }