Page callback. Generates a test feed and simulates last-modified and etags.
$use_last_modified: Set TRUE to send a last modified header.
$use_etag: Set TRUE to send an etag.
function aggregator_test_feed($use_last_modified = FALSE, $use_etag = FALSE) {
$last_modified = strtotime('Sun, 19 Nov 1978 05:00:00 GMT');
$etag = Crypt::hashBase64($last_modified);
$if_modified_since = strtotime(Drupal::request()->server
->get('HTTP_IF_MODIFIED_SINCE'));
$if_none_match = stripslashes(Drupal::request()->server
->get('HTTP_IF_NONE_MATCH'));
// Send appropriate response. We respond with a 304 not modified on either
// etag or on last modified.
if ($use_last_modified) {
drupal_add_http_header('Last-Modified', gmdate(DATE_RFC1123, $last_modified));
}
if ($use_etag) {
drupal_add_http_header('ETag', $etag);
}
// Return 304 not modified if either last modified or etag match.
if ($last_modified == $if_modified_since || $etag == $if_none_match) {
drupal_add_http_header('Status', '304 Not Modified');
return;
}
// The following headers force validation of cache:
drupal_add_http_header('Expires', 'Sun, 19 Nov 1978 05:00:00 GMT');
drupal_add_http_header('Cache-Control', 'must-revalidate');
drupal_add_http_header('Content-Type', 'application/rss+xml; charset=utf-8');
// Read actual feed from file.
$file_name = __DIR__ . '/aggregator_test_rss091.xml';
$handle = fopen($file_name, 'r');
$feed = fread($handle, filesize($file_name));
fclose($handle);
print $feed;
}