Felix, you don't need quick hosting for testing. Go to console, type ipconfig (ifconfig on Unix machines) and find your ip address (usually it is 192.168.x.x). Now go to your iPhone and use same url like on your development/test machine, but replace localhost with your ip address. Be sure your firewall is disabled on your development/test machine or accepting connections on port used in url.
For best results, use the Firefox browser..