Express.js Proxy to bypass cross-origin (CORS) HTTPS requests

proxy.js

var express = require('express'),
    app = express(),
    https = require('https'),
    request = require('request'),
    bodyParser = require('body-parser'),
    PROXY_PORT = 12345,
    HTTPS_POST = 443,
    API_ENDPOINT = '/api',
    CONTENT_TYPE = 'application/json',
    HTTPS_HOST = 'sub.domain.com',
    HTTP_METHOD = 'POST';


app.listen(PROXY_PORT);
console.log('EXPRESS.JS SERVER LISTENING ON PORT:', PROXY_PORT)

app.use(bodyParser.json());

app.use(API_ENDPOINT, function(req, res, next) {
    var options = {
        hostname: HTTPS_HOST,
        port: HTTPS_POST,
        path: API_ENDPOINT + req.url,
        method: HTTP_METHOD,
        headers: {
            'Content-Type': CONTENT_TYPE
        }
    },
    body = '';

    res.header("Access-Control-Allow-Origin", "*");
    res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");

    console.log(new Date(), ' -- Rquest Received:', req.body, req.url);

    var requ = https.request(options, function(https_res) {
        console.log(new Date(), 'statusCode: ', https_res.statusCode);
        console.log(new Date(), 'headers: ', https_res.headers);

        https_res.on('data', function(d) {
            body += d;
        });

        https_res.on('end', function() {
            res.send(body);
            console.log(new Date(), 'Sent request: ', req.body);
            next();
        });

    });

    requ.write(JSON.stringify(req.body));
    requ.end();
});