WebApiThrottleChange

GetClientIP

    protected IPAddress GetClientIp(HttpRequestMessage request)
        {
            if (request.Properties.ContainsKey("MS_HttpContext"))
            {
                IPAddress ipAddress;

                var ok = IPAddress.TryParse(((HttpContextBase)request.Properties["MS_HttpContext"]).Request.UserHostAddress,out ipAddress);

                if(ok)
                {
                    return ipAddress;
                }
            }

            if (request.Properties.ContainsKey(RemoteEndpointMessageProperty.Name))
            {
                IPAddress ipAddress;

                var ok = IPAddress.TryParse(((RemoteEndpointMessageProperty)request.Properties[RemoteEndpointMessageProperty.Name]).Address, out ipAddress);

                if(ok)
                {
                    return ipAddress;
                }
            }

            if (request.Properties.ContainsKey("MS_OwinContext"))
            {
                IPAddress ipAddress;

                var ok = IPAddress.TryParse(((Microsoft.Owin.OwinContext)request.Properties["MS_OwinContext"]).Request.RemoteIpAddress, out ipAddress);

                if (ok)
                {
                    return ipAddress;
                }
            }


            return null;
        }