It would be really great for some public projects if your internal modifications and updates to nginx were a public repo. That repo could be compiled and packaged for use of open source projects that benefit from those modifications. I say this because I've seen multiple patches from cloudflare around, but it's very difficult for 1 person to go through all of that, know what version of nginx it's for, and modify the patch for newer versions of NginX like security updates. If you modify nginx internally I don't doubt there's lots of various changes and improvements over time that don't get organized or published publicly.
I think it'd be great if more companies released their own 'opinionated' versions that update with their infrastructure. Like if I wanted to host a OpenStreetMaps tiling server hypothetically using some features cloudflare has in their nginx builds. Makes it easy for white-hats to test, too.
IIRC I've been intersted in HPACK for small http responses where the headers are larger than the body, but if I wanted to use the HPACK patch I have to re-impliment it every time an update comes out that modifies the file.
