- Added WebDAV HTTP methods and updated Fastify logger to use pino.BaseLogger as the main interface.
- Fixed several TypeScript typing issues (validateInput naming, reply.getHeader return types, Union-aware ResolveFastifyReplyType).
- Improved documentation and added new community plugins (fastify-bugsnag, fastify-lyra, fastify-keycloak) along with other docs updates.
v4.4.0
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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.