Does anyone know if the FastCGI implementation is complete i.e. it supports FastCGI processes in all three roles; Responder, Authorizer and Filter? I've always

Does anyone know if the FastCGI implementation is complete i.e. it supports FastCGI processes in all three roles; Responder, Authorizer and Filter? I've always wanted to use FastCGI more but most implementations (in Apache and Nginx at least) only support some of those roles (or require work arounds using server specific features; i.e. apache filters rather than FastCGI filters)