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try to bust through proxies for a remote address
private static readonly string[] _ipHeaderOrder = new[] { "HTTP_X_FORWARDED_FOR", "HTTP_X_CLUSTER_CLIENT_IP", "REMOTE_ADDR" };
public static string ClientAddress(this HttpRequest request)
foreach (string header in _ipHeaderOrder)
string ipAddress = request.ServerVariables[header];
if (ipAddress != null)
return ipAddress;
return string.Empty;
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