header manipulation fortify fix c#

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C#4.0

var request = (HttpWebRequest)WebRequest.Create(userResource);
request.Accept = UseJsonFormat ? "application/v1+json" : "application/v1+xml";
request.Timeout = 500000;
request.ContentType = null;
request.Method = "POST";
var ticket = GetTicket(user);

request.Headers.Add(HttpRequestHeader.Cookie, string.Format("{0} = {1}", "iSiteWebApplication", ticket));

In above code request.Headers.Add method is flagging header manipulation fortify issue. Can somebody help me to resolve this issue in HP fortify and make fortify happy.

Thanks,
Abhijit