Proxied gRPC bizarre issue

When we turn on the proxy for a A record DNS (orange-cloud) as suggested by the Cloudflare official tutorial “Understanding Cloudflare gRPC support”, the GRPC client always reports an internal error with a description of “server closed the stream without sending trailers”.

However, when we disable the proxy (gray-cloud DNS only), everything works fine.

Cluelessly enough, if we create a gray-cloud CNAME record pointing to an A record for the origin gRPC server (behind GCP HTTP/2 LB) in orange-cloud, everything works fine again.

Any help would be greatly appreciated.

Related issues:

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