/**
* Build request
*
* Adds HTTP cache headers to common headers.
*
* {@inheritdoc}
*/
protected function buildRequest()
{
$headers = parent::buildRequest();
# Cache validators
if (!empty($this->validators)) {
if (isset($this->validators['IfModifiedSince'])) {
$headers[] = 'If-Modified-Since: ' . $this->validators['IfModifiedSince'];
}
if (isset($this->validators['IfNoneMatch'])) {
if (is_array($this->validators['IfNoneMatch'])) {
$etags = implode(',', $this->validators['IfNoneMatch']);
} else {
$etags = $this->validators['IfNoneMatch'];
}
$headers[] = '';
}
}
return $headers;
}
