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Add paragraph that Http1AndHttp2 is not supported without TLS (#13891)

pull/12376/head^2
James Newton-King 2019-08-21 09:43:59 +12:00 committed by GitHub
parent a2e996d318
commit 98f814297e
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aspnetcore/grpc/troubleshoot.md
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@ -5,7 +5,7 @@ description: Troubleshoot errors when using gRPC on .NET Core.
monikerRange: '>= aspnetcore-3.0'
ms.author: jamesnk
ms.custom: mvc
ms.date: 08/12/2019
ms.date: 08/17/2019
uid: grpc/troubleshoot
---
# Troubleshoot gRPC on .NET Core
@ -79,6 +79,8 @@ public static IHostBuilder CreateHostBuilder(string[] args) =>
});
```
When an HTTP/2 endpoint is configured without TLS, the endpoint's [ListenOptions.Protocols](xref:fundamentals/servers/kestrel#listenoptionsprotocols) must be set to `HttpProtocols.Http2`. `HttpProtocols.Http1AndHttp2` can't be used because TLS is required to negotiate HTTP/2. Without TLS, all connections to the endpoint default to HTTP/1.1, and gRPC calls fail.
The gRPC client must also be configured to not use TLS. For more information, see [Call insecure gRPC services with .NET Core client](#call-insecure-grpc-services-with-net-core-client).
> [!WARNING]