enhancementhelp wanted
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描述
Title: Pass gRPC metadata to ext_authz
Description:
With current ext_authz filter implementation an external grpc_service receives only subset of request information, such as IPs and TLS details. It would be really helpful to have ability to access gRPC metadata headers as well.
Our current authorization schema is based on metadata fields added to grpc calls. Metadata is checked on server side, and we would like to move it out to Envoy filters.
It seems to be possible for http_service to configure which http headers will be passed to authz service, but nothing like that is configurable for grpc_service type.