Express route returning 404 error - node.js

Question

The express route in my node app is returning a 404 error. It works locally but on the production server it returns a 404 error (bear in mind that I changed the AJAX url to the one on my production server before uploading). My code:
server.js:
const path = require('path');
const http = require('http');
const express = require('express');
const publicPath = path.join(__dirname, '/../public');
const port = process.env.PORT || 8080;
var app = express();
var server = http.createServer(app);
app.use(express.static(publicPath));
app.post('/active-screens', function(req, res) {
res.send('route works!');
});
server.listen(port, () => {
console.log(`Server is up on port ${port}`);
});
index.js:
function checkRoute(){
$.ajax({
url: "http://localhost:8080/active-screens",
type: "POST"
})
.success(function(data){
console.log(data);
});
}
checkRoute();

Answer 1

It was a CORS issue as pointed out by #WejdDAGHFOUS.
I updated my server.js to this:
const path = require('path');
const http = require('http');
const express = require('express');
const cors = require('cors');
const publicPath = path.join(__dirname, '/../public');
const port = process.env.PORT || 8080;
var app = express();
var server = http.createServer(app);
app.use(express.static(publicPath));
app.post('/active-screens', cors(), function(req, res) {
res.send('route works!');
});
server.listen(port, () => {
console.log(`Server is up on port ${port}`);
});