Proxy Server for UI Design Team

server.js

'use strict';

let httpServer 
, http = require('http')
, path = require('path')
, url = require('url')
, fs = require('fs');

let port = process.env.www_port || 3000;
let mimeTypes = {
  "html": "text/html",
  "jpeg": "image/jpeg",
  "jpg": "image/jpeg",
  "png": "image/png",
  "js": "text/javascript",
  "css": "text/css"};

// httpServer = http.createServer(function(req, res) {
httpServer = http.createServer((req, res) => {
  let proxy, filename, body, urlReq, options, arrURL, readStream, mimeType;
  if (req.url === '/') {
    req.url = '/login.html';
  }
  body ='';
  arrURL = req.url.split('/');
  req.addListener('data',(chunk)=>{
    body += chunk;
  });
  req.addListener('error',(error)=>{
    //next(err);
  });
  req.addListener('end',(chunk)=>{
    if (chunk) {
      body += chunk;
    }
  });

  if( req.url.split('/')[1] === 'xxx'){
    // if( req.url.split('/')[1] === 'UNOUKBNDEVReportsWCF'){
    urlReq = req.url.replace(/xxx/, 'yyy');
    options = {
      //hostname: 'localhost',
      hostname: '192.168.21.50',
      port: 80,
      path: urlReq,
      method: req.method,
      headers: req.headers,
      body: body,
    };

    //debugger;
    proxy = http.request(options, (resp)=> {
      res.writeHead(200,resp.headers);
      resp.pipe(res, {
        end: true
      });
    });

    req.pipe(proxy, {
      end: true
    });

  } else if (req.url !== '/favicon.ico') {
    filename = (__dirname+ req.url.split('?')[0]);
	console.log(filename);
    fs.access(filename, function (err)  {
      mimeType = mimeTypes[path.extname(filename).split(".").reverse()[0]];
      if(err){
        res.writeHead(404, {'Content-Type': mimeType} );
        //res.statusCode = 404;
		res.end();
      } else {
        res.writeHead(200, {'Content-Type': mimeType} );
        readStream = fs.createReadStream(filename);
        readStream.pipe(res); 
      }
    });
  }
  }).listen(port);