fix: propagate the headers before the message #25
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Always propagate the headers via the proxy first, then attempt to receive the message. This fixes the issue where a connection sends the headers before the message, e.g., in the reverse GRPC tunnel implementation here: https://github.com/jhump/grpctunnel/blob/56803ed3149f539b95950ef306c01befa705ebe5/handler.go#L160-L164
Add new tests for the reverse tunnel.