- Added the fastify‑osm plugin and an option to disable or ignore the request‑id header.
- Forwarded the upgrade handling from secondary to primary server.
- Improved documentation examples and added new docs (fastify.displayName symbol, HTTPS usage, query string coercion).
v4.5.0
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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.