area/securitybughelp wanted
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説明
Today, we use HeaderMapImpl for gRPC metadata, e.g. https://github.com/envoyproxy/envoy/blob/3dd84d3b41b6be378ccb71e81c0063a84bb956e3/include/envoy/grpc/async_client.h#L70. This is not safe, since in general, this metadata may contain binary and HeaderMapImpl can't contain NUL.
We should switch to using a simple map or the like to model these values, treating them as metadata rather than headers.