Is there an internet law for when you spend weeks looking for a framework or library to solve a problem and it only reveals itself after your organization makes a really bad choice to do something else? I have been looking for exactly this kind of local proxy to dynamically hack headers and dynamically spoof responses for an internal app. This would have been the perfect starting place...
Oh lord, this should be a Law. You only find the exact framework or app you've been looking for exactly one day after you've finished implementing your own solution from whole cloth.