This is an HTTP/2 requirement. 
https://datatracker.ietf.org/doc/html/rfc7540#section-8.1.2

On Fri, May 26, 2023, at 12:09, Paul Nienaber (CW) wrote:
> Hi,
>
> Quick question regarding the HTTP middleware contract (both client and
> server):
>
> From what I've seen in the existing client middleware, it deals with cookie
> names e.g. "set-cookie" that vs. the HTTP spec ("Set-Cookie") are all
> lowercase.
>
> Does the framework around the middleware force all HTTP header names to
> lowercase (on both client and server?) as this suggests?
>
> Cheers
> Paul

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