aggregator_test.module

<?php


/**
 * Implements hook_menu().
 */
function aggregator_test_menu() {
    $items['aggregator/test-feed'] = array(
        'title' => 'Test feed static last modified date',
        'description' => "A cached test feed with a static last modified date.",
        'page callback' => 'aggregator_test_feed',
        'access arguments' => array(
            'access content',
        ),
        'type' => MENU_CALLBACK,
    );
    return $items;
}

/**
 * Page callback. Generates a test feed and simulates last-modified and etags.
 *
 * @param $use_last_modified
 *   Set TRUE to send a last modified header.
 * @param $use_etag
 *   Set TRUE to send an etag.
 */
function aggregator_test_feed($use_last_modified = FALSE, $use_etag = FALSE) {
    $last_modified = strtotime('Sun, 19 Nov 1978 05:00:00 GMT');
    $etag = drupal_hash_base64($last_modified);
    $if_modified_since = isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) ? strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']) : FALSE;
    $if_none_match = isset($_SERVER['HTTP_IF_NONE_MATCH']) ? stripslashes($_SERVER['HTTP_IF_NONE_MATCH']) : FALSE;
    // Send appropriate response. We respond with a 304 not modified on either
    // etag or on last modified.
    if ($use_last_modified) {
        drupal_add_http_header('Last-Modified', gmdate(DATE_RFC7231, $last_modified));
    }
    if ($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 = DRUPAL_ROOT . '/' . drupal_get_path('module', 'aggregator') . '/tests/aggregator_test_rss091.xml';
    $handle = fopen($file_name, 'r');
    $feed = fread($handle, filesize($file_name));
    fclose($handle);
    print $feed;
}