“404”

Automatically crawls your frontend pages, posts, and custom post types to detect broken links (404s, 410s, broken redirects, and server errors), logs them with page/section context, and notifies admins on a schedule.

Lightweight WP internal link checker. Detects 404 broken links via Ajax to minimize server load. / Ajaxを利用した軽量な内部リンクチェッカー。サーバーへの負荷を抑えつつ、投稿・固定ページ内のリンク切れを高速に検知。