Running more than 1 gRPC call using TLS causes IOException

[Derek-Chu]

I've set up a simple gRPC client and server where, when I run the client, I make 4 gRPC calls (unary -> server streaming -> client streaming -> bidirectional streaming) with the https_proxy environment variable set accordingly to the proxy's endpoint. The first call works perfectly but when the second call starts, I see this error:

If I run these gRPCs without TLS, then they all work fine. And if I make the calls without the proxy (so just client -> server), then they respond successfully as well.