primus doesn't accept custom path with engine.io about primus HOT 10 CLOSED

const Primus = require('primus');
const http = require('http');
const fs = require('fs');

const server = http.createServer(function (req, res) {
  res.setHeader('Content-Type', 'text/html');
  fs.createReadStream(__dirname + '/index.html').pipe(res);
});

const primus = new Primus(server, {
  pathname: '/mycustompath/primus',
  transformer: 'engine.io'
});

primus.on('connection', function (spark) {
  console.log(spark.id, 'connected');
});

server.listen(3000, function () {
  console.log('listening on port 3000');
});

const Primus = require('primus');
const http = require('http');
const fs = require('fs');

const server = http.createServer(function (req, res) {
  if (req.url === '/primus-client.js') {
    res.setHeader('Content-Type', 'text/javascript');
    fs.createReadStream(__dirname + '/primus-client.js').pipe(res);
    return;
  }

  res.setHeader('Content-Type', 'text/html');
  fs.createReadStream(__dirname + '/index.html').pipe(res);
});

const primus = new Primus(server, {
  pathname: '/mycustompath/primus',
  transformer: 'engine.io'
});

primus.save(__dirname + '/primus-client.js');

primus.on('connection', function (spark) {
  console.log(spark.id, 'connected');
});

server.listen(3000, function () {
  console.log('listening on port 3000');
});

primus.save('/path/to/javascript/primus.js');