A simply proxy-server can handle web-based request across CORS (easy run with node js)

proxy-server.js

const express = require('express');
const cors = require('cors');
const bodyParser = require('body-parser');

const request = require('request');

const port = 8088;

const app = express();
app.use(cors())
app.use(bodyParser.urlencoded({ extended: true }));

function requestDirect(req, res) {
	// add header with key "Host-Redirect" to tell proxy redirect to host
	let redirectUrl = req.header('Host-Redirect');

	let url = redirectUrl + req.originalUrl;
	request(
		{
			method: req.method,
			uri: url,
			form: req.body
		}
		, function (error, response, body) {
			try {
				res.status(response.statusCode);
				res.end(body);
			} catch (e) {
				res.status(500)
				res.end(error.stack)
			}
		}
	)
}

app.use(function (req, res, next) {
	// handle request url
	requestDirect(req, res);
});

app.listen(port);
console.log('Listening at http://localhost:' + port);