/// <summary>
/// Run an async function ensuring that HttpContext won't be null on the way
/// </summary>
/// <param name="context">The current HttpContext</param>
/// <param name="func">The function to run</param>
/// <param name="preparing">A method to run while preparing to run the async function</param>
/// <param name="running">A method to run while running the async function</param>
public static void Run(this HttpContext context, Func <Task> func, Action <AsyncCallContext> preparing = null, Action <AsyncCallContext> running = null)
{
context.Run <object>(async() =>
{
await func();
return(null);
}, preparing, running);
}
