context: cross-reference request and response

lib/application.js

@@ -1,4 +1,3 @@
-
 /**
  * Module dependencies.
  */
@@ -147,6 +146,8 @@ app.createContext = function(req, res){
   context.req = request.req = response.req = req;
   context.res = request.res = response.res = res;
   request.ctx = response.ctx = context;
+  request.response = response;
+  response.request = request;
   context.onerror = context.onerror.bind(context);
   context.originalUrl = request.originalUrl = req.url;
   context.cookies = new Cookies(req, res, this.keys);