streaming-test.js

// to test:
// $ echo 'GET / HTTP/1.0\n\n' | nc localhost 3012
const app    = require('express')();
const server = app.listen(3012);
const delay  = ms => new Promise(resolve => setTimeout(resolve, ms));

app.get('/', async (req, res) => {
  res.write("USERID,NAME,FBID,ACCOUNT,SUBSCRIPTION,PRICE,STATE,TIMEPERIOD\n");

  for (var i = 0; i < 10; i++) {
    res.write("23,John Doe,1234,500,SUBSCRIPITON,100,ACTIVE,30\n");
    await delay(1000);
  }

  res.end();
});

Better test this server with: curl http://localhost:3012 -N