[pgit]

HTTP/1.1 moves from Boost.Beast to Boost.HTTP (cppalliance/http, develop at 1f58e97): its sans-I/O parser and serializer, and boost::http::fields as anyhttp's Fields. After this, no build tree includes a Beast header.

Build

• cmake/http.cmake FetchContents Boost.HTTP for every tree (ASIO trees too), with capy at the existing pin, and builds only its protocol core as anyhttp_http. Upstream's CMake is skipped because it builds the router/bcrypt/JSON parts and needs Boost.JSON.
• Two patches in cmake/patches/, applied only once, both to be proposed upstream:
  • http-release-buffered-data.patch: parser::release_buffered_data() is a // TODO stub on develop. The h2c upgrade needs it.
  • http-reserve-bytes-alignment.patch: fields_base::reserve_bytes() left the field table misaligned. Found by UBSAN, and 133 tests fail there without it.
• The installed package exports anyhttp::http and capy, and ships their headers.

HTTP/1.1 backend

• h1/io.hpp holds the loops that drive the parser and serializer on the runtime layer. Boost.HTTP's own loops need a capy stream.
• Each session has one parser and one serializer, and readers and writers use them in turn.
• Behaviour change: a request released before its body is complete now shuts down the client's send side. Without it, CancellationRange/HTTP11 hangs, because the server waits for the rest of the body.
• Chunking and Content-Length stay with the library. The body is copied into the serializer's buffer because there is no zero-copy path yet.

Public API (breaking)

• Fields: iterate with .name / .value, add with append() instead of insert(), look up with value_or(name, "") instead of [].
• client::Message is now a class derived from boost::http::response with a body() string. result_int() becomes status_int().
• New: errors::end_of_stream, reason_phrase().

Tested locally

• build: 612/612, also with ANYHTTP_TEST_SCHEME=https and serially.
• build-corosio: 576/576.
• build-gcc, build-h2v2, build-asan, build-tsan: all pass.
• build-ubsan: clean over cleartext and TLS.
• build-corosio-gcc: only the three ClientAsync.Recursion cases fail, as they already do on master.
• scripts/check_package.sh: install, embed-asio and embed-corosio all pass.
• Include boundaries checked: no Beast anywhere, and no Asio beyond buffer.hpp in the COROSIO library objects.

Benchmark (Release, HTTP/1.1 cleartext, two rounds each, vs master)

Workload	Change
Small GETs	−3 to −5%
Pipelined (-m 16)	about −10%
10 MB download	−1%
10 MB upload	+5%

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