- Migrated the entire test suite from tap to the built‑in node:test runner, adding new test runner features and updating related documentation
- Added type enhancements: plugin options are now required when defined, routeOptions.method accepts string[] arrays, and a childLoggerFactory option was added to Fastify HTTP options
- Fixed several bugs and performance issues, including case‑insensitive content‑type handling, shallow copying of Fastify options before mutation, correct handling of empty host, exposeHeadRoute hook behavior, and hostname split optimization
v5.1.0
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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.