This is a Rust policy for MuleSoft Anypoint Flex. The policy implements header-based redirection. It examines incoming requests for a particular header and redirects them accordingly. The redirection is achieved by responding with a 302 HTTP status code and including a Location header that specifies the new path.

For more informaton check: Implementing a Flex Gateway Custom Policy in Rust

You can find another example of a Rust policy for Anypoint Flex here.