Started on node.js+socket.io+mongoDB on the backend for more responsivnes

server/node_modules/express/lib/router/route.js

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+/**
+ * Module dependencies.
+ */
+
+var debug = require('debug')('express:router:route');
+var Layer = require('./layer');
+var methods = require('methods');
+var utils = require('../utils');
+
+/**
+ * Expose `Route`.
+ */
+
+module.exports = Route;
+
+/**
+ * Initialize `Route` with the given `path`,
+ *
+ * @param {String} path
+ * @api private
+ */
+
+function Route(path) {
+  debug('new %s', path);
+  this.path = path;
+  this.stack = [];
+
+  // route handlers for various http methods
+  this.methods = {};
+}
+
+/**
+ * @api private
+ */
+
+Route.prototype._handles_method = function _handles_method(method) {
+  if (this.methods._all) {
+    return true;
+  }
+
+  method = method.toLowerCase();
+
+  if (method === 'head' && !this.methods['head']) {
+    method = 'get';
+  }
+
+  return Boolean(this.methods[method]);
+};
+
+/**
+ * @return {Array} supported HTTP methods
+ * @api private
+ */
+
+Route.prototype._options = function(){
+  return Object.keys(this.methods).map(function(method) {
+    return method.toUpperCase();
+  });
+};
+
+/**
+ * dispatch req, res into this route
+ *
+ * @api private
+ */
+
+Route.prototype.dispatch = function(req, res, done){
+  var idx = 0;
+  var stack = this.stack;
+  if (stack.length === 0) {
+    return done();
+  }
+
+  var method = req.method.toLowerCase();
+  if (method === 'head' && !this.methods['head']) {
+    method = 'get';
+  }
+
+  req.route = this;
+
+  next();
+
+  function next(err) {
+    if (err && err === 'route') {
+      return done();
+    }
+
+    var layer = stack[idx++];
+    if (!layer) {
+      return done(err);
+    }
+
+    if (layer.method && layer.method !== method) {
+      return next(err);
+    }
+
+    if (err) {
+      layer.handle_error(err, req, res, next);
+    } else {
+      layer.handle_request(req, res, next);
+    }
+  }
+};
+
+/**
+ * Add a handler for all HTTP verbs to this route.
+ *
+ * Behaves just like middleware and can respond or call `next`
+ * to continue processing.
+ *
+ * You can use multiple `.all` call to add multiple handlers.
+ *
+ *   function check_something(req, res, next){
+ *     next();
+ *   };
+ *
+ *   function validate_user(req, res, next){
+ *     next();
+ *   };
+ *
+ *   route
+ *   .all(validate_user)
+ *   .all(check_something)
+ *   .get(function(req, res, next){
+ *     res.send('hello world');
+ *   });
+ *
+ * @param {function} handler
+ * @return {Route} for chaining
+ * @api public
+ */
+
+Route.prototype.all = function(){
+  var callbacks = utils.flatten([].slice.call(arguments));
+  callbacks.forEach(function(fn) {
+    if (typeof fn !== 'function') {
+      var type = {}.toString.call(fn);
+      var msg = 'Route.all() requires callback functions but got a ' + type;
+      throw new Error(msg);
+    }
+
+    var layer = Layer('/', {}, fn);
+    layer.method = undefined;
+
+    this.methods._all = true;
+    this.stack.push(layer);
+  }, this);
+
+  return this;
+};
+
+methods.forEach(function(method){
+  Route.prototype[method] = function(){
+    var callbacks = utils.flatten([].slice.call(arguments));
+
+    callbacks.forEach(function(fn) {
+      if (typeof fn !== 'function') {
+        var type = {}.toString.call(fn);
+        var msg = 'Route.' + method + '() requires callback functions but got a ' + type;
+        throw new Error(msg);
+      }
+
+      debug('%s %s', method, this.path);
+
+      var layer = Layer('/', {}, fn);
+      layer.method = method;
+
+      this.methods[method] = true;
+      this.stack.push(layer);
+    }, this);
+    return this;
+  };
+});