Cake\Network\Response::etag PHP Method

Response Class Documentation Show file Open project: cakephp/cakephp

etag() public method

Second parameter is used to instruct clients that the content has changed, but semantically, it can be used as the same thing. Think for instance of a page with a hit counter, two different page views are equivalent, but they differ by a few bytes. This leaves off to the Client the decision of using or not the cached page. If no parameters are passed, current Etag header is returned.

public etag ( string \| null $hash = null, boolean $weak = false ) : string \| null
$hash	string \| null	The unique hash that identifies this response
$weak	boolean	Whether the response is semantically the same as other with the same hash or not
return	string \| null

    public function etag($hash = null, $weak = false)
    {
        if ($hash !== null) {
            $this->_headers['Etag'] = sprintf('%s"%s"', $weak ? 'W/' : null, $hash);
        }
        if (isset($this->_headers['Etag'])) {
            return $this->_headers['Etag'];
        }
        return null;
    }

Response

__construct

__debugInfo

__toString

_clearBuffer

_fileRange

_flushBuffer

_getUTCDate

_isActive

_sendContent

_sendFile

_sendHeader