Yes, I embedded a web server inside of Rescue Squad and as well as static content (like the images) it can serve up live render stats direct from the game engine. I'm pleasantly surprised how easy it was, it only took about an hour to grab NanoHttpd, integrate it and slightly tweak it to also serve a (semi)hardcoded stats page.
I plan to extend this somewhat to make it more useful, like having multiple (cross linked) pages of stats, a logging page containing trace messages, and possibly a resource/texture/rendertarget viewer as well. Any suggestions as to what else to (ab)use http for are welcome. :)
I considered embedding a web server and LLMozLib and doing all GUI stuff in html. I have a pathological dislike of writing GUI code...
I figured it could interact with the game logic either through get/post or possibly by hacking a custom javascript API into/over llMozLib.