How to change Host name in HttpWebRequest headers in unity .net 2.0?

I want to call a webpage by its ip address by adding custom values to request header for "host". "
" Code: HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://1.1.1.1"); request.Headers["Host"] = "xyz.net"; WebResponse response = request.GetResponse(); But it gives an error: **ArgumentException: restricted header** it seems that some headers cannot be modified in .net 2.0 so is there any way that i can change the host or change the .net version in unity to higher version?