NemAn/gRPCServer/Program.cs

using Microsoft.AspNetCore.Server.Kestrel.Core;
using NemAnBlazor.Services.Interfaces;
using NemAnBlazor.Services;
using ProtoBuf.Grpc.Server;
using SpotifyService.Services;
using GrpcShared.Interfaces;
using Polly;
using Polly.Extensions.Http;

var builder = WebApplication.CreateBuilder(args);

#if DEBUG
/*
builder.WebHost.ConfigureKestrel(options =>
{
    options.ListenLocalhost(5050, o => o.Protocols =
        HttpProtocols.Http2);
    options.ListenLocalhost(5051, o => o.Protocols =
        HttpProtocols.Http1AndHttp2);
});
*/
#endif

// Add services to the container.

builder.Services.AddHttpClient("HttpClient", c =>
{
    c.BaseAddress = new Uri(SpotifyService.GLOBALS.SPOTIFYURL);
    c.DefaultRequestHeaders.Add("Accept", SpotifyService.GLOBALS.MEDIATYPE);
})
    .SetHandlerLifetime(TimeSpan.FromMinutes(5))
    .AddPolicyHandler(GetRetryPolicy())
    .AddPolicyHandler(GetCircuitBreaker());

IAsyncPolicy<HttpResponseMessage> GetCircuitBreaker()
{
    return HttpPolicyExtensions
        .HandleTransientHttpError()
        //the circuit will be cut if 25% of requests fail in a 60 second window, with a minimum of 7 requests in the 60 second window,
        //then the circuit should be cut for 30 seconds:
        .AdvancedCircuitBreakerAsync(0.25, TimeSpan.FromSeconds(60),
        7, TimeSpan.FromSeconds(30), OnBreak, OnReset, OnHalfOpen);
}

 void OnHalfOpen()
{
    Console.WriteLine("Circuit in test mode, one request will be allowed.");
}

 void OnReset()
{
    Console.WriteLine("Circuit closed, requests flow normally.");
}

 void OnBreak(DelegateResult<HttpResponseMessage> result, TimeSpan ts)
{
    Console.WriteLine("Circuit cut, requests will not flow.");
}

IAsyncPolicy<HttpResponseMessage> GetRetryPolicy()
{
    return HttpPolicyExtensions
                    // HttpRequestException, 5XX and 408
                    .HandleTransientHttpError()
                    // 404
                    .OrResult(msg => msg.StatusCode == System.Net.HttpStatusCode.NotFound)
                    // Retry two times after delay
                    .WaitAndRetryAsync(3, retryAttempt => TimeSpan.FromSeconds(Math.Pow(3, retryAttempt)));
}

builder.Services.AddControllersWithViews();
builder.Services.AddRazorPages();

builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

builder.Services.AddGrpc();
builder.Services.AddCodeFirstGrpc();
builder.Services.AddCodeFirstGrpcReflection();

var app = builder.Build();

app.UseSwagger();
app.UseSwaggerUI();

// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
    app.UseWebAssemblyDebugging();
}
else
{
    app.UseExceptionHandler("/Error");
    // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
    app.UseHsts();
}

app.UseHttpsRedirection();

app.UseBlazorFrameworkFiles();
app.UseStaticFiles();

app.UseRouting();

app.UseGrpcWeb();

app.MapRazorPages();
app.MapControllers();

//app.MapGrpcService<AuthService>();
//app.MapGrpcService<AuthService>().EnableGrpcWeb();


app.MapCodeFirstGrpcReflectionService();

app.MapFallbackToFile("index.html");

app.Run();