WP REST Cache

FAQ

I have edited a page/post, do I need to clear the cache?

No, the plugin will automatically flush all cache related to the page/post you just edited.

I have created a custom post type, will the plugin cache the custom post type endpoint?

Yes, the plugin will automatically cache the endpoint of custom post types. Unless you have created a custom WP_REST_Controller for it, then it will not automatically cache the endpoint.

I have created a custom taxonomy, will the plugin cache the taxonomy endpoint?

Yes, the plugin will automatically cache the endpoint of custom taxonomies. Unless you have created a custom WP_REST_Controller for it, then it will not automatically cache the endpoint.

I have created a custom WP REST endpoint, will the plugin cache this endpoint?

No, the plugin will not cache your custom endpoint unless you tell it to cache it using the hook wp_rest_cache/allowed_endpoints (See ‚Can I register my own endpoint for caching?‘). Please keep in mind that once you do so the plugin will not automatically flush the cache of that endpoint if something is edited (it has no way of knowing when to flush the cache). It will however try to determine the relations and for the determined relations it will flush the cache automatically once the relation is edited.

Can I register my own endpoint for caching?

Yes you can! Use the hook wp_rest_cache/allowed_endpoints like this:

/**
 * Register the /wp-json/acf/v3/posts endpoint so it will be cached.
 */
function wprc_add_acf_posts_endpoint( $allowed_endpoints ) {
    if ( ! isset( $allowed_endpoints[ 'acf/v3' ] ) || ! in_array( 'posts', $allowed_endpoints[ 'acf/v3' ] ) ) {
        $allowed_endpoints[ 'acf/v3' ][] = 'posts';
    }
    return $allowed_endpoints;
}
add_filter( 'wp_rest_cache/allowed_endpoints', 'wprc_add_acf_posts_endpoint', 10, 1);

Please note: the WP REST Cache plugin will try to detect relations in the cached data to automatically flush the cache when related items are edited, but this detection is not flawless so your caches might not be flushed automatically.

Can I unregister an endpoint so it is no longer cached?

Yes you can! Use the hook wp_rest_cache/allowed_endpoints like this:

/**
 * Unregister the /wp-json/wp/v2/comments endpoint so it will not be cached.
 */
function wprc_unregister_wp_comments_endpoint( $allowed_endpoints ) {
    if ( isset( $allowed_endpoints[ 'wp/v2' ] ) && ( $key = array_search( 'comments', $allowed_endpoints[ 'wp/v2' ] ) ) !== false ) {
        unset( $allowed_endpoints[ 'wp/v2' ][ $key ] );
    }
    return $allowed_endpoints;
}
add_filter( 'wp_rest_cache/allowed_endpoints', 'wprc_unregister_wp_comments_endpoint', 100, 1);

Can I force a call to the REST API to not use caching?

Yes you can! Add the GET-parameter skip_cache=1 to your call and no caching will be used.

On the cache overview page I see the object type is ‚unknown‘. Can I help the WP REST Cache plugin to detect the object type correctly?

Yes you can! Use the hook wp_rest_cache/determine_object_type like this:

function wprc_determine_object_type( $object_type, $cache_key, $data, $uri ) {
    if ( $object_type !== 'unknown' || strpos( $uri, $your_namespace . '/' . $your_rest_base ) === false ) {
        return $object_type;
    }
    // Do your magic here
    $object_type = 'website';
    // Do your magic here
    return $object_type;
}
add_filter( 'wp_rest_cache/determine_object_type', 'wprc_determine_object_type', 10, 4 );

Can expired caches be automatically regenerated?

Yes they can! Go to Settings > WP REST Cache, on the Settings tab you can check Enable cache regeneration, this will activate a cron job which will check if there are any expired (or flushed) caches and regenerate them. Using the Regeneration interval you can determine how often this regeneration process should run. The Max number regenerate caches limits the number of regenerated caches per regeneration process, this is so your server doesn’t get flooded with the regeneration calls.

Kann ich die Option „REST-Cache löschen“ in der Admin-Leiste ausblenden?

Ja, das kannst du! Benutze den Hook wp_rest_cache/display_clear_cache_button wie folgt:

function wprc_display_clear_cache_button( $show ) {
    return false;
}
add_filter('wp_rest_cache/display_clear_cache_button', 'wprc_display_clear_cache_button', 10, 1);

Kann ich die Caches anhand der Anfrage-Header unterscheiden?

Ja, das kannst du! Dafür gibt es zwei Möglichkeiten:
1. Gehe zu Einstellungen > WP REST Cache und füge Global cachebare Anfrage-Header hinzu. Das ist eine kommagetrennte Liste. Diese Header werden für ALLE Endpunkte verwendet.
2. Benutze den Hook wp_rest_cache/cacheable_request_headers, um für jeden Endpunkt festzulegen, welche Anfrage-Header verwendet werden sollen. Zum Beispiel so:

function wprc_add_cacheable_request_headers( $cacheable_headers ) {
    $cacheable_headers['wp/v2/posts'] = 'LANG';
    return $cacheable_headers;
}
add_filter('wp_rest_cache/cacheable_request_headers', 'wprc_add_cacheable_request_headers', 10, 1);

Kann ich ändern, welche Benutzer die Einstellungen ändern und den Cache leeren können?

Ja, das kannst du! Benutze den Hook wp_rest_cache/settings_capability wie folgt:

function wprc_change_settings_capability( $capability ) {
    // Change the capability to users who can edit posts.
    return 'edit_posts';
}
add_filter('wp_rest_cache/settings_capability', 'wprc_change_settings_capability', 10, 1);

Kann ich WP-CLI benutzen, um Caches aus der Kommandozeile heraus zu leeren?

Ja, das kannst du! Benutze den Befehl wp wp-rest-cache flush, um die Caches zu leeren. Gib wp wp-rest-cache flush --help ein, um alle Optionen zu sehen.

Is Redis Object Cache supported?

We are using the WordPress transient API, so as long as you are using a Redis Object Cache plugin which enables Redis caching through the transients API it is supported.

How can I report security bugs?

You can report security bugs through the Patchstack Vulnerability Disclosure Program. The Patchstack team helps validate, triage and handle any security vulnerabilities. Report a security vulnerability.