I'm still not over the fact that they made headers all-lowercase in HTTP/2. I know the reasons, but it's so weird to have all-lowercase headers. TBH I don't see much of an uptake in the community either: since HTTP/2 came out, I've barely seen lowercase headers be proliferated in documentation of headers, e.g. MDN lists them HTTP/1 style: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers