Program.cs

using Piano;

Setup.OnStart();

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.

builder.Services.AddControllersWithViews();

builder.Services.AddCors(options => {
    options.AddDefaultPolicy(builder => {
        builder.AllowAnyOrigin()
            .AllowAnyMethod()
            .AllowAnyHeader();
    });
});

if (!Setup.PianoConfig.IsDevelopment) {
    builder.WebHost.UseKestrel(options => {
        options.ListenAnyIP(Setup.PianoConfig.Port);
    });
}

var app = builder.Build();

// Configure the HTTP request pipeline.
if (!app.Environment.IsDevelopment()) {
    // 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.UseStaticFiles();
app.UseRouting();

app.UseCors();

app.MapControllerRoute(
    name: "default",
    pattern: "{controller}/{action=Index}/{id?}");

app.MapFallbackToFile("index.html");

app.Run();