# Functions
PMMHTTPErrorHandler is a custom implementation of DefaultHTTPErrorHandler (https://github.com/grpc-ecosystem/grpc-gateway/blob/aec6aa29864109e41408491319a859f190ec4040/runtime/errors.go#L93) It injects an extra `Error` field in error responses to support old PMM clients.
PMMRoutingErrorHandler customizes the http status code for routes that can't be found (i.e.