Initializes HTTP request formats.
protected static function initializeFormats() {
static::$formats = array(
'html' => array(
'text/html',
'application/xhtml+xml',
),
'txt' => array(
'text/plain',
),
'js' => array(
'application/javascript',
'application/x-javascript',
'text/javascript',
),
'css' => array(
'text/css',
),
'json' => array(
'application/json',
'application/x-json',
),
'xml' => array(
'text/xml',
'application/xml',
'application/x-xml',
),
'rdf' => array(
'application/rdf+xml',
),
'atom' => array(
'application/atom+xml',
),
'rss' => array(
'application/rss+xml',
),
);
}