Expect:100-continue support?

[Nikratio]

Hello,

It seems to me that httpcore currently does not support the use of Expect: 100-continue (unless I've missed something?).

Is that a deliberate design decision, or would a patch to add this functionality be considered?

I did a bit of research, and it seems the underlying h2 module supports this, we just have to make it available in httpcore as well. Without changes to httpcore, the only way to use this seems to be to subclass AsyncHTTP2Connection/AsyncHTTP11Connection and overwrite the handle_async_request method (while copying & pasting most of the existing implementation).