How to proxy a media stream in Node? - node.js

Question

I want to be able to proxy a remote icecast stream to client. I've been fiddling around a lot in the past few days to no avail.
Use case:
Be able to extract analyser data out of an <audio> tag src without running into CORS issues.
My solution so far
In order to address CORS issues preventing me to create an leverage sound data directly out of the <audio>'s source, I've tried to write a tiny proxy which would pipe requests to a specific stream and return statics in any other case.
Here is my code:
require('dotenv').config();
const http = require('http');
const express = require('express');
const app = express();
const PORT = process.env.PORT || 4000;
let target = 'http://direct.fipradio.fr/live/fip-midfi.mp3';
// figure out 'real' target if the server returns a 302 (redirect)
http.get(target, resp => {
if(resp.statusCode == 302) {
target = resp.headers.location;
}
});
app.use(express.static('dist'));
app.get('/api', (req, res) => {
http.get(target, audioFile => {
res.set(audioFile.headers);
audioFile.addListener('data', (chunk) => {
res.write(chunk);
});
audioFile.addListener('end', () => {
res.end();
});
}).on('error', err => {
console.error(err);
});
});
app.listen(PORT);
The problem
The client receives a response from the proxy but this gets stalled to 60kb of data about and subsequent chunks are not received, in spite of being received by the proxy:
Any suggestion is welcome!

Answer 1

I've found a solution, use stream pipe.
const app = express();
const PORT = process.env.PORT || 4000;
let target = 'http://direct.fipradio.fr/live/fip-midfi.mp3';
// figure out 'real' target if the server returns a 302 (redirect)
http.get(target, resp => {
if(resp.statusCode == 302) {
target = resp.headers.location;
}
});
app.use(express.static('dist'));
app.get('/api', (req, res) => {
req.pipe(request.get(target)).pipe(res);
});
app.listen(PORT);