proxyServer.js

var express = require('express');
var request = require('request');
//request.debug = true;
var bodyParser = require('body-parser');
var app = express();
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }))

app.use('/proxy', function(req, res) {
    var headers = {
        "Access-Control-Allow-Origin" : "*",
        "Access-Control-Allow-Headers" : "X-M2M-Origin, x-m2m-origin",
    };
    res.set(headers);
    if (req.method == 'OPTIONS') {
        res.status(200).end();
        console.log('<OPTIONS> send headers')
        console.log(headers);
        return;
    }
    try {
        var href = /\/proxy\/(.*)/i.exec(req.originalUrl)[1];
    } catch (error) {
        res.write('no query url')
        res.end();
        return;
    }
    
    var option = {
        url : href,
        method : req.method,
        headers : req.headers,
        body : req.body,
        rejectUnauthorized: false,
        json : true,
    }
    if (req.body)
        option.headers['content-length'] = JSON.stringify(req.body).length;

    if (href) {
        request(option).on('error', function(err) {
            console.log(err)
            //res.write('query url can not request');
            res.status(404);
            res.status(404).end();
        }).pipe(res);
    }
    else {
        res.write('no query url')
        res.end();
    }
});

if (module.parent == null) {
    console.log('listen on 127.0.0.1:1889')
    app.listen(1889);
}
else
    module.exports = app;