/**
* gets the HTTP content type charset for the current response.
* returns false for non-text content types.
*
* Note: getHTTPBody must be called before this.
*
* @return string the HTTP content type charset for the current response.
* @access private
*/
function getHTTPContentTypeCharset()
{
if (count($this->responseAttachments) > 0) {
return false;
}
return parent::getHTTPContentTypeCharset();
}