- Added new HTTP methods (WebDAV body‑parsing methods, mkcalendar/report) and features like disabling request logging and handling synchronous errors in errorHandler.
- Improved TypeScript typings (narrowed reply type, nullable serialization function) and extensive documentation updates across request page, ecosystem plugins, Type Providers, and code snippets.
- Fixed bugs such as ESM import for errorCodes, CI benchmark issues, incorrect label job repo, and conditional citgm execution, plus dependency bumps.
v4.27.0
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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.