nginx reverse proxy to express code example

Example 1: nginx reverse proxy node js

. . .
    location / {
        proxy_pass http://localhost:8080;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;
    }
}

Example 2: reverse proxy using expressjs

var express  = require('express');
var app      = express();
var httpProxy = require('http-proxy');
var apiProxy = httpProxy.createProxyServer();
var serverOne = 'http://localhost:3001',
    ServerTwo = 'http://localhost:3002',
    ServerThree = 'http://localhost:3002';
 
app.all("/app1/*", function(req, res) {
    console.log('redirecting to Server1');
    apiProxy.web(req, res, {target: serverOne});
});

app.all("/app2/*", function(req, res) {
    console.log('redirecting to Server2');
    apiProxy.web(req, res, {target: ServerTwo});
});

app.all("/app2/*", function(req, res) {
    console.log('redirecting to Server3');
    apiProxy.web(req, res, {target: ServerThree});
});

app.listen(3000);