[new release] hpack, h2, h2-mirage, h2-lwt, h2-lwt-unix and h2-async (0.9.0)

[anmonteiro]

An HPACK (Header Compression for HTTP/2) implementation in OCaml

• Project page: https://github.com/anmonteiro/ocaml-h2
• Documentation: https://anmonteiro.github.io/ocaml-h2/

CHANGES:

• h2: Fix tests on 32-bit platforms
  (anmonteiro/ocaml-h2#152)
• h2-mirage: adapt to Conduit v4 and remove H2_mirage.Server_with_conduit
  (anmonteiro/ocaml-h2#154)
• h2: fix memory leaks related to trailer headers in the server and client
  implementations (anmonteiro/ocaml-h2#159
  (thanks @quernd!),
  anmonteiro/ocaml-h2#160)
• h2: allow configuring flush_headers_immediately on the client and default
  to false. This means that h2 will wait for the first request body bytes to
  be scheduled and batch HEADERS and DATA frames when sending requests
  (anmonteiro/ocaml-h2#163,
  anmonteiro/ocaml-h2#164)
• h2: Split Body.t into Body.Writer.t and Body.Reader.t
  (anmonteiro/ocaml-h2#165)
• h2: OCaml 5.00 compatibility -- add seeded_hash to scheduler.ml
  (anmonteiro/ocaml-h2#168)
• h2: Use a tail-recursive version of Angstrom.skip_many. Fixes a memory leak
  in long-running connections e.g. gRPC
  (anmonteiro/ocaml-h2#172)
• h2-async: Add an OCaml-TLS client to h2-async
  (anmonteiro/ocaml-h2#174)
• h2: Fix a bug that caused different requests to share the same headers buffer
  under concurrency (anmonteiro/ocaml-h2#182)

[anmonteiro]

I see some revdep failures. I'll open a PR adding upper bounds to those in a bit.

[anmonteiro]

Added in #21984

[kit-ty-kate]

Thanks! Could you return the fix to the hpack opam file in the repository upstream so that it can be taken into account for next time?

Also, I removed h2-async from this release as it can't be compiled. Please reopen a new PR for this particular package when it is able to be compiled.