- Expose validate and serialize functions on Request and Reply objects (new feature).
- Rename request.validate to request.validateInput (breaking change) and defer FastifyRequest type resolution.
- Fix caching of unnecessary content types, clientError handling on reused connections, and update docs (add Electron server, remove HTTP/2 experimental flag).
v4.3.0
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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.