Is there a good, hmm, what do I call it... catch-all HTTP API server? What I want is:

- a server with open port 80/443 (it may be localhost)
- that catches every single request it receives and logs it (headers and all)
- (important) with support for `multipart/form-data` (it should accept any file)
- (optionally) where I can mock a response
- (preferably) with an actual GUI
- (preferably) open-source

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