I have taken the free reversehttp service offline for the foreseeable future, because the traffic bill has been getting too high. If anyone would like to sponsor or host the publicly-available service, or would like advice on configuring a service instance of their own for their own use, please get in touch.
The code is open-source, and hosted on github. Please see the downloads page for information on getting a copy of the server source code. The README included with the source distribution contains instructions on setting up and starting the server.
Please feel free to contact me at any time if you have questions, comments, or suggestions.