Ggtcf

I run a nodeJS-app on a Raspi3 (Stretch-Lite). In the app uses express.
In a second terminal I run chromium on x-server to request the node-app.

Now the frontend-output needs some scripts and css, which makes my app.js looks like this

var ws = require('ws');
var http = require('http');
var express = require('express');
var path = require('path');
var SerialPort = require("serialport");

/* EXPRESS */
var app = express();
var router = express.Router();
app.use(express.static('templates'));
var server = http.createServer(app);

app.use('/', router);

app.get('/bootstrap.min.css', function(req, res) res.sendFile(__dirname + "/assets/css" + "/bootstrap.min.css"); );
app.get('/bootstrap-grid.min.css', function(req, res) res.sendFile(__dirname + "/assets/css" + "/bootstrap-grid.min.css"); );
app.get('/style.css', function(req, res) res.sendFile(__dirname + "/assets/css" + "/style.css"); ); 
app.get('/pr.js', function(req, res) res.sendFile(__dirname + "/assets/js" + "/pr.js"); ); 
app.get('/websocket.js', function(req, res) res.sendFile(__dirname + "/assets/js" + "/websocket.js"); ); 
app.get('/func.js', function(req, res) res.sendFile(__dirname + "/assets/js" + "/func.js"); );
app.get('/splash.png', function(req, res) res.sendFile(__dirname + "/assets//img" + "/splash.png"); ); 
app.get('/sine.png', function(req, res) res.sendFile(__dirname + "/assets/img/lfo" + "/sine.png"); ); 

this works fine.. now working further on func.js somehow suddenly the chromium gets a older version of func.js. I deleted all cache but still oder version. So I deleted the file phisically from the server, but still chromium got it somehow(!). How can that be?

I even uncommented the line in my node-appm, which deliveres the func.js

//app.get('/func.js', function(req, res) res.sendFile(__dirname + "/assets/js" + "/func.js"); );

I also unsured I upload the correct files and restart the node-app and x-server.. but still Chromium gets the file which is not there(?)

how can that be?