- Added nginx to Recommendations and async support for FastifyInstance.setErrorHandler
- Updated documentation: relative links in README, Fastify websocket description, and schema validator docs per validation type
- Fixed payload serialization check and made close() return a true Promise
v3.21.1
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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.