I am using if (Request.ServerVariables["HTTP_REFERER"] != null) redirects to AccessDenied.aspx, when request comes from https it always redirect to access denied page while http is working properly

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C

ASP.NET

I am using

if (Request.ServerVariables["HTTP_REFERER"] != null)
                        {
                            Response.Redirect("AccessDenied.aspx", false);
                            return;
                        }

When request comes from Https it always redirects to access denied page while through http it is working properly.
suggest me.