During June 2026, this developer enhanced the Shopify/rails repository by implementing strict Accept header negotiation compliant with RFC 9110. Using Ruby and Ruby on Rails, they introduced a configurable option, config.action_dispatch.strict_accept_header, which prioritizes specific media types over wildcards during content negotiation. This approach ensures that requests specifying formats like application/json receive the correct response, improving compatibility with modern clients and reducing the need for legacy workarounds. The feature maintains backward compatibility by default and is prepared for enablement in Rails 8.2. Collaboration and thorough RFC coverage contributed to a robust backend solution focused on accuracy and readiness.