C# get请求访问url 获取响应字符串 并out出response

//C# get请求访问url 获取响应字符串 并out出response
public static string HttpWebGet(string url, out System.Net.HttpWebResponse response, string cookiesStr = "", string tokenStr = "")
{
    response = null;

    try
    {
        System.Net.HttpWebRequest request = (System.Net.HttpWebRequest)System.Net.WebRequest.Create(url);
        request.Method = "GET";
        if (cookiesStr != null && cookiesStr.Length > 0)
        {
            request.Headers.Add("Cookie", cookiesStr);
        }
        //X-Access-Token: eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJleHAiOjE2NjYwOTc3NzMsInVzZXJuYW1lIjoiSklOU0dMWSJ9.DoAC6d6VTvylNBLYKKsxITxmOX-9pQ_trssOZU0S7Js
        if (tokenStr != null && tokenStr.Length > 0)
        {
            request.Headers.Add("X-Access-Token", tokenStr);
        }

        var webResponse = request.GetResponse();

        response = (System.Net.HttpWebResponse)request.GetResponse();

        var getEncode = System.Text.Encoding.Default;
        var getResponseChar = response.CharacterSet.ToLower();
        if (getResponseChar.Contains("utf"))
        {
            getEncode = System.Text.Encoding.UTF8;
        }
        else if (getResponseChar.Contains("gbk"))
        {
            //getEncode = System.Text.Encoding.GetEncoding("gb2312");
        }

        System.IO.Stream receiveStream = response.GetResponseStream();
        System.IO.StreamReader readStream = new System.IO.StreamReader(receiveStream, getEncode);

        var visitResult = readStream.ReadToEnd();

        readStream.Close();
        receiveStream.Close();
        response.Close();

        return visitResult;

    }
    catch { return ""; }
}