kubernetes/vendor/github.com/grpc-ecosystem/grpc-gateway/v2/runtime/marshal_httpbodyproto.go

type HTTPBodyMarshaler …

// ContentType returns its specified content type in case v is a
// google.api.HttpBody message, otherwise it will fall back to the default Marshalers
// content type.
func (h *HTTPBodyMarshaler) ContentType(v interface{ … }

// Marshal marshals "v" by returning the body bytes if v is a
// google.api.HttpBody message, otherwise it falls back to the default Marshaler.
func (h *HTTPBodyMarshaler) Marshal(v interface{ … }