We used this in an initial prototype of a black box testing framework. The idea being that you can record responses from AWS and other external systems and play

We used this in an initial prototype of a black box testing framework. The idea being that you can record responses from AWS and other external systems and play them back at a mitm layer so you can write end to end tests without modifying application code and without setting up all real third party systems. But we ended up switching to our mitm server since it's pretty easy to serve http and you just set http_proxy in all relevant application environments and you're done!