Socket.io server and client, connect to primus

client.js

var socket = require( 'socket.io-client' )( 'http://localhost:4567' );
//var socket = require( 'socket.io-client' )( 'http://127.0.0.1:8080/primus', {
//  transports: [ 'polling', 'websocket' ],
//  forceBase64: true,
//  rememberUpgrade: false,
//  enablesXDR: false,
//  timestampRequests: true
//} );
//var socket = require( 'socket.io-client' )( 'http://127.0.0.1:8080/primus' );

socket.on( 'connect', function() {
  console.log( 'connected!' );
} );
socket.on( 'error', function( err ) {
  console.log( 'error ' + err.toString() );
} );
socket.on( 'disconnect', function() {
  console.log( 'disconnected!' );
} );
socket.on( 'reconnect', function( num ) {
  console.log( 'reconnected ' + num + ' times' );
} );
socket.on( 'reconnect_attempt', function() {
  console.log( 'attempting to reconnect' );
} );
socket.on( 'reconnecting', function( num ) {
  console.log( 'reconnecting ' + num + ' times' );
} );
socket.on( 'reconnect_error', function( err ) {
  console.log( 'error reconnecting ' + err.toString() );
} );
socket.on( 'reconnect_failed', function() {
  console.log( 'reconnect failed' );
} );


socket.on( 'boop', function( data ) {
  console.log( 'Received ' + JSON.stringify( data ) );
  socket.close();
} );

socket.emit( 'beep', {
  event: 'beeper'
} );

results from client

## When it works

connected!
Received {"message":"here's a response","mirror":{"event":"beeper"}}
disconnected!

## When trying to connect to primus server

attempting to reconnect
reconnecting 1 times
error reconnecting Error: xhr poll error
attempting to reconnect
reconnecting 2 times
error reconnecting Error: xhr poll error

server.js

var io = require( 'socket.io' )( {
  transports: [ 'websocket' ],
} );

io.attach( 4567 );

io.on( 'connection', function( socket ) {
  console.log( 'socket connection made ' + socket.id );
  socket.on( 'beep', function( data ) {
    console.log( 'Received beep from socket ' + socket.id + ', returning boop' );
    socket.emit( 'boop', {
      message: "here's a response",
      mirror: data
    } );
  } );
} )