My Web client cant connect to the private server.

I created a little private server and i wanted to add a web client to it.
But when i try to enter the world it says

Connecting to Server
Connected!
...

But after that the screen stays black and nothing happens..
If you download the same file of the website and use in a projector it works perfect..
Anyone knows what to do??

To access the the client with a browser you need to include a js file called "rotmg.UrlLib.js"(I don't know why.)

Try this:

Hope this works.