Developed a new configuration option for Envoy external authorization providers in the istio/api repository, enabling automatic clearing of the route cache when authorization settings change for both HTTP and gRPC providers. This feature, implemented using Go and Protocol Buffers, introduced a clear_route_cache proto and corresponding configuration management logic to ensure routing decisions remain accurate as policies evolve. The work addressed the need for consistent policy enforcement by invalidating outdated route caches, aligning with recent configuration surface updates. The implementation focused on API development and protocol design, contributing a targeted feature that improves reliability in dynamic authorization environments without introducing bug fixes.