LiteSpeed Cache (LSCache)

Drupal.org-native integration for LiteSpeed Cache. Adds the response headers LSCache needs to cache Drupal pages keyed by Drupal cache tag, and ships a Purge-framework submodule that invalidates LSCache entries when content changes. Stable (1.3.x), security-advisory covered.

Invalidation that works on real LiteSpeed builds

Some LiteSpeed builds silently ignore tag-based PURGE: the request returns HTTP 200 but evicts nothing, so edits never clear. The purger supports a per-URL PURGE strategy (purge_strategy: auto|tag|url) that resolves each cache tag to its canonical Drupal paths and sends one PURGE per URL; auto self-selects from a probe.

• drush lscache:diag probes the connected LiteSpeed instance for URL- versus tag-PURGE effectiveness and prints a recommendation.
• A self-populating tag-affinity table plus an operator-pinnable static_url_map resolve aggregate tags (node_list, View configs) to the listing pages that carry them. drush lscache:list-tag-coverage reports gaps.

More

• Optional per-user (private) caching that is BigPipe and drupalSettings aware, so it does not break Drupal AJAX for logged-in users.
• Vary cookies, ESI fragments for per-user chunks inside shared pages, and status-report diagnostics for the required .htaccess directives, the PURGE host, and scheme or Host-header mismatches.
• Requires Drupal ^10.3 || ^11 under LiteSpeed Web Server, OpenLiteSpeed, or a LiteSpeed PaaS host. The Purger submodule requires Purge.