Looks similar. Docker image with entry point but the entry point is a server instead of process and it reuses the docker container instead of shutting it down
Would be great to get a quick comparison between the two.
Another tool in the same category is hook.io microcule https://github.com/Stackvana/microcule
both iron functions and microcule are battle tested by companies
Then again, I certainly wouldn't use it for everything, but ymmv
Is there a way to map query parameters and / or http headers to input JSON? (a la API Gateway).
iron.io seems a trifle better in that regard, although and I've been fiddling with it and trying to figure out the amount of work involved in getting it to run on ARM, which seems to be quite a bit more.
Here's a quick-start guide for ARM: https://gist.github.com/alexellis/665332cd8bd9657c9649d0cd6c...
I went through the repo and didn't spot anything obvious (might have missed it).
All sample functions are using a POST - within your function you receive that value through STDIN and output response via STDOUT.
Example Alexa Skill: