Webapi and sessions problem

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ASP.NET

session

WebAPI

I am trying to add sessionstate to my existing asp.net application. I have added

httpContext.Current.SetSessionStateBehavior(SessionStateBehavior.Required)

to the global.asax file but each time i make a call to the api, a new session is created.

Here is how i am trying to view the session

var session = HttpContext.Current.Session;
            if (session != null)
            {
                if (session["TestSession"] == null)
                {
                    session["TestSession"] = DateTime.Now;
                }
                return "TestSession: " + session["TestSession"];
            }

            return ("No Session");

Just wondering if anyone else has encountered this problem, i am using a session state sqldatabase to store the session

What I have tried:

i have tried adding httpContext.Current.SetSessionStateBehavior(SessionStateBehavior.Required) to the global.asax

and then loading a value from the session