- Added body parsing for COPY/MOVE/MKCOL methods and support for different body schemas per content type.
- Fixed multiple bugs: config type in RouteShorthandOptions, response serializer handling, duplicated route error, nullish host handling, and response reply ordering.
- Introduced deprecation warning for JSON shorthand, added Fastify v4 codemods, and updated documentation (default maxParamLength, codemod guides) along with sponsor link improvements.
v4.29.0
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Fix for two Fastify security advisories (GHSA‑w2qp‑rph6‑63g4 and GHSA‑3m5p‑2c4r‑xxw2).
Added per‑route logging for Google Cloud Functions and introduced `Reply.prototype.mediaType` for easier content‑type handling.
Fixed trailer state clearing when removing all trailers and corrected requestCompleted handling to use null instead of undefined.