Program.cs

using component_blazor.Components;
using Microsoft.AspNetCore.DataProtection;
using Microsoft.AspNetCore.Server.Kestrel.Core;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
builder.Services.AddRazorComponents()
    .AddInteractiveServerComponents();

builder.Services.Configure<HostOptions>(options =>
{
    options.ShutdownTimeout = TimeSpan.FromSeconds(1);
});

// Configure Kestrel to allow port reuse and SO_REUSEADDR
builder.WebHost.ConfigureKestrel((context, options) =>
{
    options.ListenAnyIP(5054, listenOptions =>
    {
        listenOptions.Protocols = HttpProtocols.Http1AndHttp2;
    });
});

// Configure data protection for Docker
builder.Services.AddDataProtection()
    .PersistKeysToFileSystem(new DirectoryInfo("/var/dpkeys"))
    .SetApplicationName("component-blazor");

var app = builder.Build();

// Configure the HTTP request pipeline.
if (!app.Environment.IsDevelopment())
{
    app.UseExceptionHandler("/Error", createScopeForErrors: true);
    // 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.UseStatusCodePagesWithReExecute("/not-found", createScopeForStatusCodePages: true);

app.UseForwardedHeaders();

app.UseAntiforgery();

app.MapStaticAssets();
app.MapRazorComponents<App>()
    .AddInteractiveServerRenderMode();

app.Run();