Hi, here's a basic gzip response Here's an example usage:

 $rep = $this->getResponse('gzip');
 $path=JELIX_APP_WWW_PATH.'some_file';
 $rep->mimeType=files::getMimeType($path);
 $rep->content=file_get_contents($path);
 return $rep;

, and here's the gzipResponse.class.php code:

 <?php
 class gzipResponse extends jResponse {
     /**
     * @var string
     */
     protected $_type = 'gzip';
 
     /**
      * text content
      * @var string
      */
     public $content = '';
     public $mimeType = '';
 
     /**
      * output the content with the text/plain mime type
      * @return boolean    true si it's ok
      */
     public function output(){
         global $gJConfig;
         if($this->hasErrors()) return false;
         if ((substr_count($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip'))) {
         	$this->addHttpHeader('Content-Encoding','gzip');
         	$this->content=ob_gzhandler($this->content,5);
         } else {
         	# code...
         }
         
         $this->addHttpHeader('Content-Type',$this->mimeType.';charset='.$gJConfig->charset,false);
         $this->_httpHeaders['Content-length']=strlen($this->content);
         $this->sendHttpHeaders();
         echo $this->content;
         return true;
     }
 
     /**
      * output errors
      */
     public function outputErrors(){
         global $gJConfig;
         header("HTTP/1.0 500 Internal Server Error");
         header('Content-Type: text/plain;charset='.$gJConfig->charset);
         if($this->hasErrors()){
             foreach( $GLOBALS['gJCoord']->errorMessages  as $e){
                echo '['.$e[0].' '.$e[1].'] '.$e[2]." \t".$e[3]." \t".$e[4]."\n";
             }
         }else{
             echo "[unknow error]\n";
         }
     }
 }

Of course, as I've also seen in ticket requests, the best way to gzip would be having an 'isGzip' flag in all the http response types

thanks for this contribution, but as you said, "the best way to gzip would be having an 'isGzip' flag in all the http response types" (so in the jResponse class)