Why uppercase HTTP headers?

[gwillem]

What is the reason aiohttp converts HTTP headers to uppercase? It is ok according to RFC, but virtually every other client and server uses capitalized headers.

I am mimicking regular browsers so I want to stay as close to their behaviour as possible.

[asvetlov]

It was easy to implement.
Upper-cased names are here from very beginning and 100% compatible with the standard.
Also using upper-case is faster thanks to str.upper(). For CamelCase new function is needed.

[gwillem]

Ok!

[DriverX]

It was easy to implement.

How?
upstr() encapsulated into https://github.com/KeepSafe/aiohttp/blob/master/aiohttp/protocol.py#L611 and change behavior is too hard (too many overrides).

[asvetlov]

I mean we've decided to use upper case at very beginning. Period.

HTTP2 prescribes lower-cased header names BTW.

[lock]

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