1
 2/**
 3 * Module dependencies.
 4 */
 5
 6var utils = require('./utils');
 7
 8/**
 9 * Initialization middleware, exposing the
10 * request and response to eachother, as well
11 * as defaulting the X-Powered-By header field.
12 *
13 * @param {Function} app
14 * @return {Function}
15 * @api private
16 */
17
18exports.init = function(app){
19  return function expressInit(req, res, next){
20    req.app = res.app = app;
21    if (app.enabled('x-powered-by')) res.setHeader('X-Powered-By', 'Express');
22    req.res = res;
23    res.req = req;
24    req.next = next;
25
26    req.__proto__ = app.request;
27    res.__proto__ = app.response;
28
29    res.locals = res.locals || utils.locals(res);
30
31    next();
32  }
33};