eZ\Publish\Core\MVC\Symfony\Routing\SimplifiedRequest::setHost PHP Method

    public function setHost($host)
    {
        $this->host = $host;
    }

 public function reverseMatch($siteAccessName)
 {
     $hostElements = explode('.', $this->request->host);
     $elementNumber = $this->elementNumber - 1;
     if (!isset($hostElements[$elementNumber])) {
         return null;
     }
     $hostElements[$elementNumber] = $siteAccessName;
     $this->request->setHost(implode('.', $hostElements));
     return $this;
 }