how to use custom files on a webserver

[creeperita09]

so i have a webserver in express.js that serves some custom audio files that i want to use on etched tho i get everytime this error:

[12:30:06] [Worker-Main-7/ERROR] [gg.mo.et.ap.so.AbstractOnlineSoundInstance/]: Failed to load audio from url: https://creeperita104.is-a.dev/rickroll.mp3
java.io.IOException: The provided URL is a stream, but that is not supported
	at gg.moonflower.etched.api.sound.source.AudioSource.downloadTo(AudioSource.java:146) ~[etched-3.0.2.jar%23503!/:?] {re:classloading}
	at gg.moonflower.etched.api.sound.source.RawAudioSource.lambda$new$0(RawAudioSource.java:24) ~[etched-3.0.2.jar%23503!/:?] {re:classloading}
	at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1768) ~[?:?] {}
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136) ~[?:?] {}
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) ~[?:?] {}
	at java.lang.Thread.run(Thread.java:833) ~[?:?] {re:mixin}

the server code is this:

const express = require('express');
const path = require('path');
const fs = require('fs');
const app = express();

app.get('/rickroll.mp3', (req, res) => {
    const filePath = path.join(__dirname, 'rickroll.mp3');
    fs.stat(filePath, (err, stats) => {
        if (err) {
            console.error('Error while getting file stats:', err);
            res.status(500).send('Error while getting file stats.');
            return;
        }

        res.setHeader('Content-Type', 'audio/mpeg');
        res.setHeader('Content-Disposition', 'attachment; filename="rickroll.mp3"');
        res.setHeader('Content-Length', stats.size);
        res.setHeader('Accept-Ranges', 'bytes');
        
        res.sendFile(filePath, (err) => {
            if (err) {
                console.error('Error while sending the file:', err);
                res.status(500).send('Error while sending the file.');
            }
        });
    });
});

const port = process.env.PORT || 3000;
app.listen(port, () => {
    console.log(`Server is running on port ${port}`);
});

[creeperita09]

like am i doing anything wrong here?