A new 2.2.0 release of the accept_language gem brings it into full compliance with RFC 7231 and RFC 4647. The update replaces outdated RFC 2616 references, renames internal methods for clarity, and adds comprehensive tests for parsing the HTTP Accept-Language header.

This library provides a lightweight, thread-safe parser for matching language preferences in web applications. It handles quality values, declaration order, and basic filtering as defined by the IETF, ensuring accurate content localization for Ruby developers building APIs or web services.

The move to current RFCs is a necessary maintenance step, as RFC 2616 was obsoleted in 2014. Developers can now rely on a more modern and accurately documented tool for a common but tricky web standard.