key kUrlRequest;
key kDynDnsRequest;
default
{
    on_rez(integer foo)
    {
        kUrlRequest=llRequestSecureURL();
    }
    state_entry()
    {
        kUrlRequest=llRequestSecureURL();
    }
    changed(integer change)
    {
        if((change & CHANGED_REGION) ||(change & CHANGED_REGION_START))
            kUrlRequest=llRequestSecureURL();
    }
    http_request(key id, string method, string body)
    {
        if(id==kUrlRequest)
        {
            if(method == URL_REQUEST_GRANTED)
            {
                //kDynDnsRequest = llHTTPRequest(...);
                //Do your DynDns Request here! >:3
            }
        }
        else if(id!=kDynDnsRequest)
        {
            llHTTPResponse(NULL_KEY, 200, "Your sub is at "+llGetRegionName());
        }
    }
}