express.js reverse proxy

server.js

const express = require('express'), 
      request = require('request'); 
 
const app = express();   

app.use('/fpp', function(req, res) { 
    res.header("Access-Control-Allow-Origin", "*"); 
    req.pipe(request("https://api-us.faceplusplus.com/facepp/v3" + req.url)).pipe(res); 
}); 
 
app.listen(process.env.PORT || 3000);