Re: curl 8.10.0 regression breaks uploads with HTTP/2 and http.postbuffer

> On Fri, 13 Sep 2024, Patrick Steinhardt wrote:
> 
> >  - In there we hit the `large_request` code path. We set up
> >    CURLOPT_READFUNCTION and CURLOPT_SEEKFUNCTION. The callback that
> >    uses our buffer is the one set up via CURLOPT_READFUNCTION, which is
> >    `rpc_out()`.
> 
> Thanks, I ended up able to write a stand-alone reproducer. Stefan Eissing
> wrote up a fix that seems to fix the case for us at least and it would be
> great if you could test this in your end:
> 
>   https://github.com/curl/curl/pull/14895
> 
> The actual code patch is tiny. The PR is mostly about adding test cases to
> reproduce and verify.