Mostly just hooking up all the API's - aka, "making it work", and making it work in the context of nginx. As a reference point, the Apache implementation took a while to get right even just because understanding all of the gotchas of Apache's worker model and surrounding API's took time - half a dozen false starts, etc. Now it's solid.

If someone has good understanding of nginx internals, then any input, guidance, etc, would be awesome, as it would short circuit a lot of that extra work. We have a design doc in progress, I'll work on making it public and will share it in the project readme. In the meantime, if you have any suggestions, open an issue on the repo and let us know!