Homebrew curl HTTP/3 support about homebrew-core HOT 4 CLOSED

Closing this out for now because there isn't anything actionable for us in the near future. We can reopen this if/when there is something that can be done here.

from homebrew-core.

libnghttp2 is an HTTP/2 library.

❯ brew desc libnghttp2
libnghttp2: HTTP/2 C Library

Perhaps you were thinking of libnghttp3?

❯ brew desc libnghttp3
libnghttp3: HTTP/3 library written in C

from homebrew-core.

The missing bit is a QUIC library.

• ngtcp2 (which we do not currently package) became stable recently but does not work with OpenSSL so would require using multiple SSL libraires (or switching the entire stack).
• openssl itself does have QUIC support - but it's still considered experimental by curl. This may change in OpenSSL 3.4 in October if the API & performance improves. It is however a "free" dependency as we already depend on OpenSSL anyway.
• quiche is not suitable for us as it would bring in Rust to the curl dependency tree (and is still experimental anyway).
• msquic (also not packaged by us yet) is documented by curl as "not properly functional".

from homebrew-core.

Oh. Whooops. Confused nghttp2 and nghttp3. Yeah so we don't have an http/3 quic library... So you can close this if you don't want to have a ticket for tracking adding this support.

ngtcp2/nghttp3 are the only stable ones in cURL ATM. Using OpenSSL with it currently requires a fork of OpenSSL (quictls) with a different SONAME due to what I can only assume are politics leading to OpenSSL not wanting to support those low level APIs... Not sure if there is an option of using that fork only for ngtcp2, sounds risky having two versions loaded if not explicitly supported by the library...

The OpenSSL QUIC implementation will probably take a while until it is stable, and also stable in cURL...

from homebrew-core.