4zero4

4zero4 makes your 404 pages useful. When a visitor reaches a URL that no longer
exists, the plugin builds a search query from the requested address and redirects
the visitor to your site’s search results, so they land on relevant content
instead of an empty error page.

For example, a request for /my-old-product-name/ that no longer resolves is
turned into a search for “my old product name”.

Key points:

• Zero configuration. Activate it and it works.
• Temporary redirect (302). The original URL may become valid again, so the
  redirect is never cached as permanently moved.
• Front-end only. It never interferes with the admin area, feeds or the REST
  API, and only acts on normal GET page views.
• No external services. The plugin does not send any data anywhere and does
  not use tracking or analytics.

Developer hooks

The behaviour can be customised with filters:

• p4zero4_search_terms — change (or clear, to skip) the terms extracted from the URL.
• p4zero4_redirect_url — change (or clear, to cancel) the destination URL.
• p4zero4_redirect_status — change the HTTP status code (default 302).