Cache Tags for Cloudflare

Cache Tags for Cloudflare does two things:

1. Tagging — adds a Cache-Tag HTTP response header to singular posts, pages, and custom post types so Cloudflare can invalidate them by tag.
2. Purging — calls the Cloudflare API to purge the relevant tags when content changes (post publish/update/trash/delete and taxonomy term edits).

The two features can be enabled independently.

Works on any Cloudflare plan. The Cache-Tag header and purge-by-tag are available on all Cloudflare plans (Free, Pro, Business, and Enterprise); purge API rate limits scale with your plan.

Default tags

For singular content the plugin emits:

• content
• b{id} (site scope: b1 on single site, b{blog_id} on multisite)
• b{id}-p{ID}
• b{id}-pt-{post_type}
• b{id}-t{term_id} for every public taxonomy term the post belongs to

Example header:

Cache-Tag: content,b1,b1-p42,b1-pt-post,b1-t5

Term tags use the numeric term ID (b1-t5), so they stay stable when a term is renamed or its slug changes.

Credentials

Provide a scoped Cloudflare API token (Zone → Cache Purge permission) and a Zone ID. Define them in wp-config.php for best security:

define( 'CACHE_TAGS_CF_API_TOKEN', 'your-scoped-token' );
define( 'CACHE_TAGS_CF_ZONE_ID', 'your-zone-id' );

When these constants are defined they take precedence and the settings fields become read-only. Otherwise enter them under Settings → Cache Tags.

Purge tools

The Settings → Cache Tags screen has a Purge tab for manual, on-demand purges by group: a whole post type, a taxonomy term, everything, or raw comma-separated tags. Saving valid credentials on the Settings tab automatically verifies the Cloudflare connection and unlocks the purge tools.

Automatic purging

When Auto-purge on changes is enabled and valid credentials are set, the plugin purges the affected tags automatically on these events:

• Post published, updated, trashed, or untrashed (any transition to or from the published status) — purges b{id}-p{ID} plus the post’s b{id}-t{term_id} tags.
• Post permanently deleted — purges b{id}-p{ID} and its b{id}-t{term_id} tags.
• Taxonomy term edited or deleted — purges b{id}-t{term_id}.

Only public post types and taxonomies are considered; revisions and autosaves are ignored. Tags collected during a request are de-duplicated and sent as a single batched purge after the response (in Cloudflare’s 30-tags-per-request batches). Draft-only edits, comments, menu/widget/theme changes, and plugin/core updates do not trigger a purge — use the Purge tab, WP-CLI, or the cache_tags_for_cloudflare/purge_tags filter for those. Static files such as images are served outside WordPress and are not tagged or purged by tag.

Extending the tags

Filter the tags emitted on a response:

add_filter( 'cache_tags_for_cloudflare/tags', function ( array $tags, WP_Post $post ) {
    $tags[] = 'author-' . $post->post_author;
    return $tags;
}, 10, 2 );

Filter the tags purged on a content change:

add_filter( 'cache_tags_for_cloudflare/purge_tags', function ( array $tags, string $context, $object ) {
    return $tags;
}, 10, 3 );

React to purges:

add_action( 'cache_tags_for_cloudflare/purged', function ( array $tags ) {} );
add_action( 'cache_tags_for_cloudflare/purge_failed', function ( array $tags, string $message ) {} );

Programmatic purging

Trigger an immediate purge from your own code with these action hooks:

do_action( 'cache_tags_for_cloudflare/purge_post_type', 'page' );
do_action( 'cache_tags_for_cloudflare/purge_terms', 'category', [ 'news', 'sport' ] );
do_action( 'cache_tags_for_cloudflare/purge_post', 42 );
do_action( 'cache_tags_for_cloudflare/purge_all' );
do_action( 'cache_tags_for_cloudflare/purge', [ 'b1-t5', 'content' ] );

These hooks purge immediately (they are not batched on shutdown like auto-purge). Term slugs passed to .../purge_terms are resolved to their numeric term IDs automatically.

WP-CLI

wp cache-tags purge --post-type=page
wp cache-tags purge --taxonomy=category --terms=news,sport
wp cache-tags purge --post=42
wp cache-tags purge --tags=b1-t5,content
wp cache-tags purge --all
wp cache-tags verify

External services

This plugin connects to the Cloudflare API (https://api.cloudflare.com) to verify your credentials and to purge cached content by cache tag. Cloudflare is required for the plugin’s purging feature to work; the tagging feature (emitting Cache-Tag headers) works without contacting any external service.

The plugin contacts Cloudflare in the following cases, and only after you have provided a Cloudflare API token and Zone ID:

• Verifying credentials — when you save credentials on the settings screen or run wp cache-tags verify, the plugin calls GET https://api.cloudflare.com/client/v4/user/tokens/verify. It sends your API token (in the Authorization header) so Cloudflare can confirm the token is valid.
• Purging cache — when content changes and auto-purge is enabled, or when you purge manually via the settings screen or wp cache-tags purge, the plugin calls POST https://api.cloudflare.com/client/v4/zones/{zone-id}/purge_cache. It sends your API token (in the Authorization header), your Zone ID (in the request URL), and the list of cache tags to purge (in the request body). It does not send post content, personal data, or visitor information.

No data is sent to Cloudflare until you configure credentials, and no request is made unless one of the actions above is triggered.

Cloudflare is a third-party service provided by Cloudflare, Inc. By using this plugin’s purging feature you agree to Cloudflare’s terms and privacy policy:

• Terms of Service: https://www.cloudflare.com/website-terms/
• Privacy Policy: https://www.cloudflare.com/privacypolicy/