Use Object.create to setup request & response prototypes

History.md

@@ -5,6 +5,7 @@ unreleased
   * Remove usage of `res._headers` private field
     - Improves compatibility with Node.js 8 nightly
   * Skip routing when `req.url` is not set
+  * Use `Object.create` to setup request & response prototypes
   * Use `statuses` instead of `http` module for status messages
   * deps: debug@2.6.1
     - Allow colors in workers

lib/express.js

@@ -41,8 +41,16 @@ function createApplication() {
   mixin(app, EventEmitter.prototype, false);
   mixin(app, proto, false);
 
-  app.request = { __proto__: req, app: app };
-  app.response = { __proto__: res, app: app };
+  // expose the prototype that will get set on requests
+  app.request = Object.create(req, {
+    app: { configurable: true, enumerable: true, writable: true, value: app }
+  })
+
+  // expose the prototype that will get set on responses
+  app.response = Object.create(res, {
+    app: { configurable: true, enumerable: true, writable: true, value: app }
+  })
+
   app.init();
   return app;
 }

lib/request.js

@@ -25,11 +25,17 @@ var proxyaddr = require('proxy-addr');
 
 /**
  * Request prototype.
+ * @public
  */
 
-var req = exports = module.exports = {
-  __proto__: http.IncomingMessage.prototype
-};
+var req = Object.create(http.IncomingMessage.prototype)
+
+/**
+ * Module exports.
+ * @public
+ */
+
+module.exports = req
 
 /**
  * Return request header.

lib/response.js

@@ -35,11 +35,17 @@ var vary = require('vary');
 
 /**
  * Response prototype.
+ * @public
  */
 
-var res = module.exports = {
-  __proto__: http.ServerResponse.prototype
-};
+var res = Object.create(http.ServerResponse.prototype)
+
+/**
+ * Module exports.
+ * @public
+ */
+
+module.exports = res
 
 /**
  * Module variables.