gistfile1.cs

public class TestModule : Nancy.NancyModule
{
  public TestModule()
  {
    Get["/"] = _ => 
    {
      return "I am sync!";
    };
    
    Get["/async"] = async _ =>
    {
      await System.Threading.Tasks.Task.Delay(1000);
      return "I am Async!"; 
    }
  }
}