ContentSubtype returns the content-subtype for the given content-type.

ContentType builds full content type with the given sub-type.

EncodeDuration encodes the duration to the format grpc-timeout header accepts.

ExtraMetadata returns the incoming metadata in ctx if it exists.

ParseMethod splits service and method from the input.

ParseTarget splits target into a resolver.Target struct containing scheme, authority and endpoint.

WithExtraMetadata creates a new context with incoming md attached.