http-proxy example

const http = require('http');
const httpProxy = require('http-proxy');
const express = require('express'),
    bodyParser = require('body-parser');

// listen port
const port = 9997;

// create proxy server
const proxy = httpProxy.createProxyServer({});

proxy.on('proxyReq', function (proxyReq, req, res, options) {
    if (req.body) {
        let bodyData = JSON.stringify(req.body);        
        console.log(bodyData);
        proxyReq.setHeader('Content-Type', 'application/json');
        proxyReq.setHeader('Content-Length', Buffer.byteLength(bodyData));
        // Stream the content
        proxyReq.write(bodyData);
    }
});

proxy.on('proxyRes', function (proxyRes, req, res) {
    var body = new Buffer('');
    proxyRes.on('data', function (data) {
        body = Buffer.concat([body, data]);
    });
    proxyRes.on('end', function () {
        body = body.toString();
        console.log(body);
        res.end("my response to cli");
    });
});

const app = express()
    .use(bodyParser.json()) //json parser
    //.use(bodyParser.urlencoded()) //urlencoded parser
    .use(function (req, res) {
        const fqdn = req.headers.host.split(':')[0];
        const hostname = fqdn.split('.')[0];
        const target = 'http://localhost:8080';
        // proxy the request upstream
        proxy.web(req, res, {
            target: target
        });
        console.log(`Routing ${req.headers.host} to ${target}`);
    });


http.createServer(app).listen(port, function(){
    console.log('proxy on 8013');
});