Unwrap AsyncErrors to find real error.

utils/pub/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.
 
 /// Helpers for dealing with HTTP.
 library pub.http;
 
 import 'dart:async';
 import 'dart:io';
 import 'dart:json';
 
 // TODO(nweiz): Make this import better.
 import '../../pkg/http/lib/http.dart' as http;
 import 'curl_client.dart';
 import 'io.dart';
 import 'log.dart' as log;
+import 'utils.dart';
 
 // TODO(nweiz): make this configurable
 /// The amount of time in milliseconds to allow HTTP requests before assuming
 /// they've failed.
 final HTTP_TIMEOUT = 30 * 1000;
 
 /// An HTTP client that transforms 40* errors and socket exceptions into more
 /// user-friendly error messages.
 class PubHttpClient extends http.BaseClient {
   http.Client inner;
@@ skipping 23 matching lines @@
       // 401 responses should be handled by the OAuth2 client. It's very
       // unlikely that they'll be returned by non-OAuth2 requests.
       if (status < 400 || status == 401) {
         return new Future.immediate(streamedResponse);
       }
 
       return http.Response.fromStream(streamedResponse).then((response) {
         throw new PubHttpException(response);
       });
     }).catchError((e) {
+      e = getRealError(e);
       if (e is SocketIOException &&
           e.osError != null &&
           (e.osError.errorCode == 8 ||
            e.osError.errorCode == -2 ||
            e.osError.errorCode == -5 ||
            e.osError.errorCode == 11004)) {
         throw 'Could not resolve URL "${request.url.origin}".';
       }
       throw e;
     }), HTTP_TIMEOUT, 'fetching URL "${request.url}"');
@@ skipping 56 matching lines @@
 
 /// Exception thrown when an HTTP operation fails.
 class PubHttpException implements Exception {
   final http.Response response;
 
   const PubHttpException(this.response);
 
   String toString() => 'HTTP error ${response.statusCode}: '
       '${response.reasonPhrase}';
 }