I'm using an app that makes http requests for content. I'd like to capture those requests and change them on the fly, so that a different request goes out to the http server, and thus different content comes back. I could do this with a full fledged web proxy, but I am hoping for a simpler and more transparent solution, possibly something that hooks into the OS to catch those network calls.
AdMuncher is my program of choice for this task on Windows.