From: https://github.com/apiman/apiman/issues/257

Proxified url containing %23 (aka: urlencoded #) are cut after the char %23.

Ex: https://192.168.99.100:8443/apiman-gateway/my-arg/my-service/1.0/api/persons/%2325:12/knows is proxified into https://api.something.com/api/persons/