function HTTP_GET()
 {
     $json = new paloSantoJSON();
     $pCore_calendar = new core_Calendar();
     $fields = isset($_GET["fields"]) ? $_GET["fields"] : NULL;
     if (is_null($fields)) {
         header("HTTP/1.1 400 Bad Request");
         $error = "You need to specify by GET the parameter \"fields\"";
         $json->set_status("ERROR");
         $json->set_error($error);
         return $json->createJSON();
     }
     $result = $pCore_calendar->getHash($fields);
     if ($result === FALSE) {
         $error = $pCore_calendar->getError();
         if ($error["fc"] == "DBERROR") {
             header("HTTP/1.1 500 Internal Server Error");
         } else {
             header("HTTP/1.1 400 Bad Request");
         }
         $json->set_status("ERROR");
         $json->set_error($error);
         return $json->createJSON();
     } else {
         $json = new Services_JSON();
         return $json->encode($result);
     }
 }