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HTTP v2.8.0

Diff since v2.7.1

HTTP 2.8.0 preserves caller spelling for outgoing HTTP/1 header names and matches names case-insensitively. canonicalize_headers=true restores the opt-in canonical spelling. HTTP/2 still sends lowercase names; received headers keep canonical spelling. Code that compares stored caller-supplied names or entire Headers collections exactly can observe this change.

This release also fixes request Host display, makes HTTP/2 received-trailer merging linear, and waits for split trailer blocks to finish before reporting request-body EOF. Small fixed-length HTTP/1 stream responses use one transport write, with safe connection closure after partial-write failures.

Other changes since 2.7.1 preserve empty header values in get, accept tuples of header entries, honor copyheaders=false ownership, and bound buffered upload allocations.

Included PRs: [#1373], [#1374], [#1375], [#1376], [#1378], [#1379], [#1380].

Merged pull requests:

  • Preserve empty header values in get (#1373) (@quinnj)
  • Preserve owned headers and bound buffered transfer allocations (#1374) (@quinnj)
  • Accept tuples of header entries (#1375) (@quinnj)
  • Coalesce small fixed-length HTTP/1 stream responses (#1376) (@quinnj)
  • Show the Host line the HTTP/1 writer sends when displaying a request (#1379) (@quinnj)
Source: README.md, updated 2026-09-24