What language(s) are you using gRPC with? In any case, it will be very hard 
for us to help with such an old version; is there any way for you to update 
it?

On Wednesday, November 28, 2018 at 6:37:25 AM UTC-8, Pramma wrote:
>
>
> While analysing tcpdump of gRPC comm between our client (restricted env, 
> on a network device) to server, i find following behaviour. In SSL npn 
> negotiation, it negotiated for "h2", but in actual grpc packet, Application 
> Data Protocol says 'Application Data' instead of 'http2'.
>
>
> I compared another tcpdump from diff client (not a network device, on a 
> ubuntu), SSL npn negotiation happened for h2 and packet header had, 
> Application Data Protocol: http2
>
>
> So i want to understand which is the fallback protocol grpc client might 
> have used to send the actual grpc data after negotiating for h2?
>
> I am concerned because in this restricted env (network device), grpc fails 
> intermittently. Note i am using gRPC 1.0.0. and i cannot change it for now. 
>
>
> Is grpc relying on any external took for h2 support?? In both these cases, 
> i used gRPC 1.0.0. 1st client seems not capable of sending h2 at least as 
> per this dump.
>
> Any help will be appreciated
>

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