4

I have a subdomain:

https://blog.example.com/

I forcibly redirects to directory:

https://www.example.com/blog

By changing site URL and some RewriteRule on .htaccess.

My .htaccess:

    <IfModule mod_rewrite.c>
    RewriteEngine On

    RewriteBase /blog/
    RewriteRule ^index\.php$ - [L]
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteRule . /blog/index.php [L]

    RewriteCond %{HTTP:X-Forwarded-Host}i ^example\.com
    RewriteCond %{HTTP_HOST} ^blog\.example\.com$
    RewriteRule ^/?(.*)$ https://www.example.com/blog/$1 [L,R=301,NC]

    RewriteCond %{HTTP:X-Forwarded-Proto} !https
    RewriteCond %{HTTPS} off
    RewriteRule ^/?(.*)$ https://www.example.com/blog/$1 [L,R=301,NC]
    </IfModule>

My wordpress address and site address are:

WordPress Address (URL): /blog

Site Address (URL): https://www.example.com/blog

Now the website working fine, but I found an error in wp-admin canonical url on all admin pages:

Uncaught SecurityError: Failed to execute 'replaceState' on 'History': A history state object with URL 'blog.example.com/wp-admin/index.php'; cannot be created in a document with origin 'example.com'; and URL 'example.com/blog/wp-admin/index.php';

When I dig more I found the canonical link is still subdomain( blog.example.com ) :

<link id="wp-admin-canonical" rel="canonical" href="http://blog.example.com/wp-admin" />
    <script>
        if ( window.history.replaceState ) {
            window.history.replaceState( null, null, document.getElementById( 'wp-admin-canonical' ).href + window.location.hash );
        }
    </script>

Is there any solution for changing this canonical url from https://blog.example.com to https://www.example.com/blog

3
  • Any luck I have this too when using https its showing http:// Oct 11, 2016 at 19:34
  • I also have a wrong wp-admin-canonical url ... did you ever find a fix for this?
    – higuita
    Feb 2, 2017 at 22:25
  • I couldn't find a solution for this. Instead I moved my wordpress setup to amazon instance and database to RDS. Then Stop using subdomain redirection and directly pointed /blog location to the amazon instance. All good now. Sep 19, 2018 at 10:21

2 Answers 2

2

wp-admin-canonical is broken, as it assumes how WordPress is installed.

there was a plugin to fix it, but the plugin was removed from the plugin repository apparently. It is still on github and pluginmirror though: https://github.com/wp-plugins/remove-wp-canonical-url-admin-hack http://www.pluginmirror.com/plugins/remove-wp-canonical-url-admin-hack/

1
  • On version wordpress version 4.8.1, it looks like this is not needed anymore, but older versions may still need this, so at least lets document it
    – higuita
    Aug 21, 2017 at 21:06
1

Update

The code below didn't really worked for me, as it adds a correct canonical tag but I wasn't able to remove the wrong one with remove_action.

Also, I found that pagination and sorting links in post and page lists had the wrong URL on it as well.

So the solution has been much simpler, just add $_SERVER['HTTP_HOST'] = 'www.yoursite.com'; anywhere in wp-config.php.


Previous answer

I've overrided the wp-admin-canonical by adding this hooks in functions.php:

remove_action( 'admin_head', 'wp_admin_canonical_url' );
add_action( 'admin_head', 'wp_set_admin_canonical_url' );

function wp_set_admin_canonical_url() {
    $removable_query_args = wp_removable_query_args();

    if ( empty( $removable_query_args ) ) {
        return;
    }

    // Ensure we're using an absolute URL.
    $current_url  = admin_url( preg_replace( '#^[^?]*/wp-admin/#i', '', $_SERVER['REQUEST_URI'] ) );
    $filtered_url = remove_query_arg( $removable_query_args, $current_url );
    ?>
    <link id="wp-admin-canonical" rel="canonical" href="<?php echo esc_url( $filtered_url ); ?>" />
    <script>
        if ( window.history.replaceState ) {
            window.history.replaceState( null, null, document.getElementById( 'wp-admin-canonical' ).href + window.location.hash );
        }
    </script>
    <?php
}

I've taken the code from this pull request: https://github.com/WordPress/wordpress-develop/pull/1504

3
  • 1
    thank you, it works like a charm
    – aRTURIUS
    Mar 3, 2023 at 15:29
  • but it was doubling up the resulting code so i commented out add_action( 'admin_head', 'wp_admin_canonical_url' ); in wp-admin/includes/admin-filters.php
    – Mazzy
    Oct 11, 2023 at 0:21
  • You should not edit Wordpress Core files as your changes will be overrided on the next update.
    – campsjos
    Oct 11, 2023 at 9:33

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