anchor.diff:      var url = '$proxyUrl/${req.root.servicePath}${req.path}';
       var payload = req.hasPayload ? stringify(req.payload) : null;
       var httpRequest = httpHandler.request(url, req.httpMethod, payload: payload);
  -    
  +
       var c;
       c = new StreamController<Response>(onCancel: () {
         // Only cancel requests if they haven't already completed.
  
positive.code:   }
  }
  
  class StreamyHttpRequest {
    final Future<StreamyHttpResponse> future;
    final CancelFn cancel;
    
    StreamyHttpRequest(this.future, this.cancel);
  }
  
  
negative.code:         httpRequest.cancel();
        }
      });
  
      httpRequest.future.then((resp) {
        if (resp.statusCode != 200) {
          Map jsonError = null;
  