reverse proxy express

proxy.js

/**
 * @fileOverview a middleware for express deployment behind a reverse proxy
 * @param {string} proxy - the known reverse proxy host
 * @param {string} proxied_service - the url assigned by proxy
 * @return {function} the middleware
 * /
function proxied (proxy, proxied_service) {
  return function (req, res, next) {
    req.proxied = false;
    req.proxied_prefix = '';
    res.locals.proxied_prefix = '';
    if (req.get('x-forwarded-host') && req.get('x-forwarded-host') === proxy) {
      // req.proxied and req.proxied_prefix can be used in routes
      req.proxied = true;
      req.proxied_prefix = url.parse(proxied_service).pathname;
      // res.locals.prefix can be used in render
      res.locals.proxied_prefix = url.parse(proxied_service).pathname;
    } 
    next();
  };
}

module.exports = {
  proxied: proxied
};