public function getURLPrefix()
 {
     $url = parent::getURLPrefix();
     if (Director::isDev() || Director::isTest()) {
         $urlarray = parse_url($url);
         // define override
         if (defined('DEV_SUBSITE_' . Subsite::currentSubsiteID())) {
             $subsiteurl = 'DEV_SUBSITE_' . Subsite::currentSubsiteID();
             return constant($subsiteurl) . $urlarray['path'];
         }
         if (!Subsite::currentSubsite() instanceof Subsite) {
             return $url;
         }
         // if set in config settings
         $currentDomain = Subsite::currentSubsite()->getPrimarySubsiteDomain();
         if (Director::isTest()) {
             $currentDomain = Subsite::currentSubsite()->TestDomainID ? Subsite::currentSubsite()->TestDomain() : $currentDomain;
         }
         if (Director::isDev()) {
             $currentDomain = Subsite::currentSubsite()->DevDomainID ? Subsite::currentSubsite()->DevDomain() : $currentDomain;
         }
         if (!$currentDomain) {
             return $url;
         }
         return $currentDomain->getFullProtocol() . $currentDomain->Domain . $urlarray['path'];
     }
     return $url;
 }