public static string GetIPAddress([NotNull] this HttpRequest thisValue)
{
string ipStr = thisValue.Headers["HTTP_CF_CONNECTING_IP"];
if (string.IsNullOrEmpty(ipStr))
{
ipStr = thisValue.ServerVariables["HTTP_X_CLUSTER_CLIENT_IP"];
}
if (string.IsNullOrEmpty(ipStr))
{
ipStr = thisValue.ServerVariables["HTTP_X_FORWARDED_FOR"];
}
if (string.IsNullOrEmpty(ipStr))
{
ipStr = thisValue.ServerVariables["REMOTE_ADDR"];
}
if (string.IsNullOrEmpty(ipStr))
{
ipStr = thisValue.UserHostAddress;
}
if (!string.IsNullOrEmpty(ipStr))
{
int n = ipStr.IndexOf(',');
if (n > -1)
{
ipStr = n > 0
? ipStr.Substring(0, n)
: null;
}
}
if (IPAddressHelper.IsLoopback(ipStr))
{
IPAddress ip = IPAddressHelper.GetLocalIP();
if (ip != null)
{
ipStr = ip.ToString();
}
}
return(ipStr.ToNullIfEmpty());
}