I'm not familiar with jellybean, but it sounds like you are running a web server on your local machine. If that is the case, you may be able to replace "hostname" with "localhost" or "127.0.0.1".
Depending on the setup, you may need to explicitly reference the file you are trying to load, which might need to be in a specific subdirectory of the server. e.g.:
http://localhost:5000/index.html
As you can see, there are a lot of maybes and mights here, so can you fill us in a little more about your setup and what you are trying to do?