WebSockets with codeigniter

[eluser]Unknown[/eluser]
Hello,
I have two questions:
1.-How do you start the server? Is it enough writing the url in the browser to start? For example: http://localhost/my-project/index.php/server

2.-I can't connect the client with the server. Firefox says "Can't establish a connection to the server at ws://localhost:12345/my-project/index.php/server

Thanks