gRPC-web и клиенты ASP.NET Core 3+¶

public static IServiceCollection AddCountryServiceGrpcWebAspNetCoreClient(
    this IServiceCollection services,
    ILoggerFactory loggerFactory,
    string countryServiceUri)
{
    services.AddGrpcClient<CountryServiceClient>(o =>
        {
            o.Address = new Uri(countryServiceUri);
        })
        //Добавляем GrpcWebHandler здесь
        .ConfigurePrimaryHttpMessageHandler(() => new GrpcWebHandler(new HttpClientHandler()))
        .AddInterceptor(() => new TracerInterceptor(loggerFactory.CreateLogger<TracerInterceptor>()))
        .ConfigureChannel(o =>
        {
            o.CompressionProviders = new List<ICompressionProvider>
            {
                new BrotliCompressionProvider()
            };
            o.MaxReceiveMessageSize = 6291456;
            o.MaxSendMessageSize = 6291456;
        });

    return services;
}