dependency-injection-based-on-request-headers.cs

public static class HiddenCookieExtensions
{
    public static IServiceCollection AddScopedByHiddenCookie<TService, THiddenImplementation, TDefaultImplementation>(this IServiceCollection services)
        where TService: class
        where THiddenImplementation: TService
        where TDefaultImplementation: TService
    {
        services.AddScoped<TService>(provider =>
        {
            var context = provider.GetRequiredService<IHttpContextAccessor>();
            var isHidden = context?.HttpContext?.Request.Cookies.ContainsKey("hidden") == true;

            if (isHidden)
            {
                return provider.GetRequiredService<THiddenImplementation>();
            }

            return provider.GetRequiredService<TDefaultImplementation>();
        });


        return services;
    }
}