ConfigureHttpClient in AddGrpcClient configuration

What version of gRPC and what language are you using?

v2.36 C# .Net 5.0

What operating system (Linux, Windows,…) and version?

macOS 11.2.3

What runtime / compiler are you using (e.g. .NET Core SDK version dotnet --info)

SDK Version: 5.0.102 Runtime: Microsoft.NETCore.App 5.0.2

What did you do?

The way I configure the GrpcClient with the IHttpClientBuilder to manage authorization is as follows:

            services.AddGrpcClient<MyGrpcServiceClient>(options =>
            {
                options.Address = configureOptions.Address;
            })
            .ConfigureHttpClient(client =>
            {
                client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", Token);
            });

What did you expect to see?

I expected the authorization header to be set, but it’s empty. This doesn’t seem to be executed anymore. I use this pattern also with .Net 3.1 projects. I have to admit, I can’t find this pattern in the docs, so I guess this pattern isn’t used very much.

[tverboon]

@JamesNK The interceptor with CallCredentials doesn’t work on macOS, because it demands a secure connection. This is how I did get it to work on macOS.

services.AddSingleton<AuthorizationHeaderInterceptor>();
services.AddGrpcClient<MyGrpcServiceClient>(options =>
{
    options.Address = configureOptions.Address;
})
.AddInterceptor<AuthorizationHeaderInterceptor>();

public class AuthorizationHeaderInterceptor : Interceptor
{
    public override AsyncUnaryCall<TResponse> AsyncUnaryCall<TRequest, TResponse>(
        TRequest request,
        ClientInterceptorContext<TRequest, TResponse> context,
        AsyncUnaryCallContinuation<TRequest, TResponse> continuation)
    {
        var token = "Bearer ey...";
        var headers = new Metadata();
        headers.Add(new Metadata.Entry("Authorization", token));

        var newOptions = context.Options.WithHeaders(headers);

        var newContext = new ClientInterceptorContext<TRequest, TResponse>(
            context.Method,
            context.Host,
            newOptions);

        return base.AsyncUnaryCall(request, newContext, continuation);
    }
}

[ScottKane]

Also worth noting I’m using protobuf-net.Grpc, can I still use AddGrpcClient? I’m currently using GrpcChannel.FromAddress with grpc-web