server.js

var express=require('express');

var app = express();
const PORT = process.env.PORT || 3000;

app.use(function (req, res, next){
    if(req.headers['x-forwarded-proto'] === 'https') {
        res.redirect('http://' + req.hostname + req.url); //redirect HTTPS traffic over HTTP
    } else { 
        next();
    }
})

app.use(express.static('public'));

app.listen(PORT, function(){
    console.log("Express is running on port " + PORT);
})