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v4.12.22

OpenSignLabs/OpenSignv4.12.22May 22, 2026by yusukebe

AI Summary

Updates include upgrading Vitest to v4, fixing MIME charset specifications, ensuring compression respects encoding headers, and improving Deno WebSocket subprotocol handling. Adds msgpack support as a compressible content type.

Key Highlights

  • Updated vitest to v4
  • Fixed MIME charset specification per type
  • Fixed compression to respect Accept-Encoding when encoding option is set
  • Fixed Deno to echo negotiated WebSocket subprotocol in upgrade response
  • Added msgpack as a compressible content type

New Features

  • Msgpack support for compression

Full Release Notes

## What's Changed
* chore: update vitest to v4 and cleanups by @BlankParticle in https://github.com/honojs/hono/pull/4952
* fix(mime): specify charset parameter per MIME type instead of mechanical detection by @renatograsso10 in https://github.com/honojs/hono/pull/4912
* fix(compress): respect Accept-Encoding when encoding option is set by @LeSingh1 in https://github.com/honojs/hono/pull/4951
* fix(deno): echo negotiated WebSocket subprotocol in upgrade response by @ATOM00blue in https://github.com/honojs/hono/pull/4955
* feat: add msgpack as a compressible content type by @na-trium-144 in https://github.com/honojs/hono/pull/4957

## New Contributors
* @renatograsso10 made their first contribution in https://github.com/honojs/hono/pull/4912
* @LeSingh1 made their first contribution in https://github.com/honojs/hono/pull/4951
* @ATOM00blue made their first contribution in https://github.com/honojs/hono/pull/4955
* @na-trium-144 made their first contribution in https://github.com/honojs/hono/pull/4957

**Full Changelog**: https://github.com/honojs/hono/compare/v4.12.21...v4.12.22