UnityWebRequest get request header Host

Hello community, I am trying to learn UnityWebRequest usage. I am wondering how do I check the http request Host header. Right now I have this:

string testUrl = "https://www.google.com/";
            
UnityWebRequest request = UnityWebRequest.Get(testUrl);

Debug.Log($"Request Created: {request.GetRequestHeader("Host")}");

This only logs an empty string to the console. Could someone points me to where I am doing wrong? Thanks

Closing the question. As per the Unity documentation:

UnityWebRequest. GetRequestHeader only retrieves custom header fields