I know this topic has come up a lot, but I haven't found one that works for my problem..
I have a GuestTokenValidationAttribute Class that derives from ActionFilterAttribute, in there I receive a token from the header and I use it as a String token. Then I want to add that token to a session, but no matter what I do the Session is always null.
Please guys any guidance or help will be much appreciated,
Code Example below:
public class GuestTokenValidationAttribute : ActionFilterAttribute
{
    public override void OnActionExecuting(HttpActionContext actionContext)
    {
         string token;
        try
        {
           token =  actionContext.Request.Headers.GetValues("Authorization-Token").First();
        }
        catch (Exception)
        {
            actionContext.Response = new HttpResponseMessage(HttpStatusCode.Unauthorized)
            {
                Content = new StringContent("Unauthorized User")
            };
            return;
        }
        if(string.IsNullOrEmpty(token))
        {
          actionContext.Response = new HttpResponseMessage(HttpStatusCode.Unauthorized)
            {
                Content = new StringContent("Unauthorized User")
            };
            return;  
        }
        try
        {
            var repository = DependencyResolver.Current.GetService<IRepository<Guest>>();
            var guest = repository.GetAll().FirstOrDefault(x => x.Token == token);
            if(guest == null)
            {
                actionContext.Response = new HttpResponseMessage(HttpStatusCode.Unauthorized)
                {
                    Content = new StringContent("Unauthorized User")
                };
                return;  
            }
        }
        catch (Exception)
        {
            actionContext.Response = new HttpResponseMessage(HttpStatusCode.Unauthorized)
            {
                Content = new StringContent("Unauthorized User")
            };
            return;
        }
       HttpContext.Current.Session.Add("guesttoken" ,token);
        base.OnActionExecuting(actionContext);
    }