nitori OP wrote on August 19, 2024 at 3:11 PM (edited on August 19, 2024 at 3:18 PM)

Reply to comment by emma in Why are browsers not automatically downgrading to HTTP/1 when they encounter a 505 in HTTP/2 or HTTP/3 by nitori

as i understand it, this mode is never going to happen under normal browsing, though.

I don't think any of my scenarios are normal at all lol :P

HTTP_1_1_REQUIRED (0x0d)

I definitely did not know about this until now, thanks! And searching online it seems like curl does retry its request in HTTP/1.1 if it encounters this. Personally I think it still would've made more sense for the HTTP/2 authors to extend 505 instead, especially since they kept the 1.1 response codes from 2xx-5xx (except 426) anyway, and you can explain to the user why you can't support HTTP/2 for the request in a 505's body... But glad to know there's an error code that can signal to the client to downgrade

nitori OP wrote on August 20, 2024 at 2:06 AM

Anyway while it's cool to know that the HTTP/2 connection error code exists, I have zero clue on how to make nginx return it (or force it in a situation where it returns it) lol

https://github.com/search?q=repo%3Anginx%2Fnginx+HTTP_1_1_REQUIRED&type=code