Nette\Http\IResponse::setContentType PHP Method

    function setContentType($type, $charset = NULL);

 /**
  * Sends response to output.
  * @return void
  */
 public function send(Nette\Http\IRequest $httpRequest, Nette\Http\IResponse $httpResponse)
 {
     if ($this->charset !== null) {
         $httpResponse->setContentType($this->contentType);
         $httpResponse->setContentType($this->contentType . ';charset=' . $this->charset);
     } else {
         $httpResponse->setContentType($this->contentType);
     }
     $httpResponse->setHeader('Content-Disposition', 'attachment; filename="' . $this->name . '"');
     $length = strlen($this->data);
     $httpResponse->setHeader('Content-Length', $length);
     echo $this->data;
 }