AutheliaMultiDomainProxy/Backend/Program.cs

using System.Text;

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddRazorPages();
builder.Services.AddControllers();

builder.WebHost.ConfigureKestrel(serverOptions => {
	serverOptions.RequestHeaderEncodingSelector  = _ => Encoding.UTF8;
	serverOptions.ResponseHeaderEncodingSelector = _ => Encoding.UTF8;
});

var app = builder.Build();

if (!app.Environment.IsDevelopment()) {
	app.UseExceptionHandler("/Error");
}

app.UseStaticFiles();

app.UseRouting();

app.UseAuthorization();

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

app.Run();