Setup Server-Server SSL communication using socket.io in node.js

I'm trying to setup a server to server link using socket.io over ssl connection. This is my example:

/**
 * Server
 */


var app = require('express')();
var config = require('./config');
var https = require('https');
var http = require('http');
var fs = require('fs');
var server = https.createServer({key: fs.readFileSync(config.ssl.key), cert: fs.readFileSync(config.ssl.cert), passphrase: config.ssl.passphrase}, app);
//var server = http.createServer(app);
var io = require('socket.io').listen(server);

server.listen(config.port);

app.get('/', function (req, res) {
    res.send('Server');
  //res.sendfile(__dirname + '/index.html');
});

io.sockets.on('connection', function (socket) {
  socket.emit('news', { hello: 'world' });
  socket.on('my other event', function (data) {
    console.log(data);
  });
});



/**
 * Client
 */


var io = require('socket.io-client');
//var socket = io.connect('http://localhost', {port: 8088});
var socket = io.connect('https://localhost', {secure: true, port: 8088});
  socket.on('connect', function(){
    socket.on('event', function(data){});
    socket.on('disconnect', function(){});
  });

The code works fine when ran without SSL. I suspect it could be my self-signed certificate not being accepted, but I do not know how to make the client accept it.

Can I accept a self-signed SSL certificate, or is there another approach I can take?

After some more searching, adding this in the client makes it work:

require('https').globalAgent.options.rejectUnauthorized = false;

/**
 * Client
 */


var io = require('socket.io-client');
//var socket = io.connect('http://localhost', {port: 8088});

require('https').globalAgent.options.rejectUnauthorized = false; 

var socket = io.connect('https://localhost', {secure: true, port: 8088});
  socket.on('connect', function(){
    socket.on('event', function(data){});
    socket.on('disconnect', function(){});
  });