Add UWS_HTTP environment variable

lib/application.js

@@ -613,7 +613,7 @@ app.render = function render(name, options, callback) {
  */
 
 app.listen = function listen() {
-  var server = http.createServer(this);
+  var server = process.env.UWS_HTTP ? require('uws').http.createServer(this) : http.createServer(this);
   return server.listen.apply(server, arguments);
 };
 

lib/request.js

@@ -28,7 +28,7 @@ var proxyaddr = require('proxy-addr');
  */
 
 var req = exports = module.exports = {
-  __proto__: http.IncomingMessage.prototype
+  __proto__: process.env.UWS_HTTP ? require('uws').http.getRequestPrototype() : http.IncomingMessage.prototype
 };
 
 /**

lib/response.js

@@ -38,7 +38,7 @@ var vary = require('vary');
  */
 
 var res = module.exports = {
-  __proto__: http.ServerResponse.prototype
+  __proto__: process.env.UWS_HTTP ? require('uws').http.getResponsePrototype() : http.ServerResponse.prototype
 };
 
 /**