[wp-trac] [WordPress Trac] #21978: Introduce an action before 404 headers are sent

[WordPress Trac]

#21978: Introduce an action before 404 headers are sent
-----------------------------+-------------------------
 Reporter:  ethitter         |       Type:  enhancement
   Status:  new              |   Priority:  normal
Milestone:  Awaiting Review  |  Component:  Query
  Version:  3.4.2            |   Severity:  normal
 Keywords:  has-patch        |
-----------------------------+-------------------------
 Currently there are actions that fire after the requested URL is parsed,
 but none between when the parsed query arguments are attempted and the 404
 header is sent. As a result, hooking in to redirect 404 requests must
 happen at `parse_request`, adding overhead where it often isn't needed.
 The attached patch introduces an action immediately before the 404 headers
 are sent.

 This is useful for a variety of reasons, such as when a site migrates from
 a different CMS. If post slugs are maintained, WordPress handles the
 redirection, but special cases may exist where manual redirection is
 needed. By waiting until after WordPress has made its various attempts at
 locating the requested content, logic related to these redirects could be
 simplified, and the number of times this logic fires can be greatly
 reduced.

-- 
Ticket URL: <http://core.trac.wordpress.org/ticket/21978>
WordPress Trac <http://core.trac.wordpress.org/>
WordPress blogging software