- Added new request property `originalUrl`, exposed `pluginName` on FastifyInstance, introduced type narrowing for status().send() chains and stricter `decorate()` validation.
- Fixed multiple bugs: prevented secondary server creation with external server, handled empty buffer bodies, corrected type definitions, avoided undefined routeConfig errors, fixed HTTP header overflow status, prevented memory leaks when ...
- Enhanced documentation: added ecosystem entries for better sqlite3, cacheman, Zod type provider, constraints option description, and a new "Principles" guide, plus minor JSDoc fixes.
v4.19.0
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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.