One of the most common causes of a WordPress HTTP error 404 not found is a problem with how WordPress generates your permanent links. As you may know, WordPress provides you with several options for formatting the links of your posts and pages. Another solution you can look at for WordPress 404 errors when the Post or Page does exist is to use a plugin like WP 301 Redirects, which automatically recognizes & redirects 404 pages to similar URLs. Is404 Determines whether the query has resulted in a 404 (returns no results). 404page plugin is a free plugin given by WordPress to create and customize 404 error pages. WordPress allows users to create a page that is shown instead of a 404 error page. The 404page plugin saves users from getting into a deadlock state. You can create a webpage like any other page and select it as your 404page. With more than 1 million active installs, Redirection is one of the most popular 404 redirect plugins on WordPress. This plugin is free, simple, and works like a charm. The plugin allows you to easily redirect the traffic from broken links to new URLs.
Set the Headers for 404, if nothing is found for requested URL.
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Description Description
Issue a 404 if a request doesn’t match any posts and doesn’t match any object (e.g. an existing-but-empty category, tag, author) and a 404 was not already issued, and if the request was not a search or the homepage.
Otherwise, issue a 200.
This sets headers after posts have been queried. handle_404() really means 'handle status'. By inspecting the result of querying posts, seemingly successful requests can be switched to a 404 so that canonical redirection logic can kick in.
Source Source
File: wp-includes/class-wp.php
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Uses Uses
Wordpress Admin 404
| Uses | Description |
|---|---|
| wp-includes/query.php:is_favicon() | Is the query for the favicon.ico file? |
| wp-includes/class-wp.php:pre_handle_404 | Filters whether to short-circuit default header status handling. |
| wp-includes/general-template.php:get_bloginfo() | Retrieves information about the current site. |
| wp-includes/class-wp-query.php:WP_Query::set_404() | Sets the 404 property and saves whether query is feed. |
| wp-includes/query.php:is_404() | Determines whether the query has resulted in a 404 (returns no results). |
| wp-includes/query.php:is_robots() | Is the query for the robots.txt file? |
| wp-includes/query.php:is_singular() | Determines whether the query is for an existing single post of any post type (post, attachment, page, custom post types). |
| wp-includes/query.php:is_search() | Determines whether the query is for a search. |
| wp-includes/query.php:is_paged() | Determines whether the query is for a paged result and not for the first page. |
| wp-includes/query.php:is_author() | Determines whether the query is for an existing author archive page. |
| wp-includes/query.php:is_tag() | Determines whether the query is for an existing tag archive page. |
| wp-includes/query.php:is_category() | Determines whether the query is for an existing category archive page. |
| wp-includes/query.php:is_tax() | Determines whether the query is for an existing custom taxonomy archive page. |
| wp-includes/query.php:is_home() | Determines whether the query is for the blog homepage. |
| wp-includes/query.php:is_feed() | Determines whether the query is for a feed. |
| wp-includes/query.php:get_query_var() | Retrieves the value of a query variable in the WP_Query class. |
| wp-includes/query.php:is_post_type_archive() | Determines whether the query is for an existing post type archive page. |
| wp-includes/query.php:get_queried_object() | Retrieves the currently queried object. |
| wp-includes/load.php:is_admin() | Determines whether the current request is for an administrative interface page. |
| wp-includes/functions.php:status_header() | Set HTTP status header. |
| wp-includes/functions.php:nocache_headers() | Set the headers to prevent caching for the different browsers. |
| wp-includes/plugin.php:apply_filters() | Calls the callback functions that have been added to a filter hook. |
| wp-includes/user.php:is_user_member_of_blog() | Find out whether a user is a member of a given blog. |
| wp-includes/comment-template.php:pings_open() | Determines whether the current post is open for pings. |
Wordpress 404 Not Found
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