Try to consume both of REST and gRPC services from the console client of the gRPC demo sample

[hikalkan]

I created the sample: https://github.com/abpframework/abp-samples/tree/master/GrpcDemo

It works. However, we have a problem: Microsoft document leads to make the server to support HTTP/2. However, client application can not call REST endpoints in this case. I couldn't be able to configure all HttpClients (those used to authenticate to IDS4 and call REST endpoints) to use Http/2. There are solutions on the web, but I didn't spend much time to be honest.

I disabled the related lines: https://github.com/abpframework/abp-samples/blob/master/GrpcDemo/test/GrpcDemo.HttpApi.Client.ConsoleTestApp/ConsoleTestAppHostedService.cs#L28

@maliming can you look at that. Thanks.

[maliming]

Set the DefaultRequestVersion property of HttpClient to HttpVersion.Version20 to solve.

Wait for abp v 2.9 #4138

[maliming]

The DefaultRequestVersion property doesn't apply to the HttpClient.SendAsync method. The Http.HttpRequestMessage parameter passed as the argument to the HttpClient.SendAsync method has its own Version property that controls the HTTP version used for the request.

dotnet/runtime#31190

Components using SendAsync need to be changed to be compatible with http2.
Including methods such as IdentityModel's RequestClientCredentialsTokenAsync.
However, DefaultRequestVersion does not support netstandard2.0. This problem also needs to be resolved.

[maliming]

Wait: #3907