canonical_redirect drops query

[tdlewis77]

The if block at line 206 of wp-includes/canonical.php drops the query portion of the URL. For example:

• ​https://www.mysite.com/members?page=dashboard

redirects to

• ​https://www.mysite.com/members/

instead of

• ​https://www.mysite.com/members/?page=dashboard

[tdlewis77]

Replying to tdlewis77:
It's worse than I thought. If I enter the URL as

• ​https://www.mysite.com/members/?page=dashboard

It still redirects to:

• ​https://www.mysite.com/members/

[peterwilsoncc]

Hello and thank you for the report.

This occurs because page is a ​reserved term in WordPress. WordPress Core uses the page=X query string parameter for pagination of posts, pages and custom post types (page=2 is page 2, which redirects to /my-page/2).

In your case, redirect_canonical() is working as intended: the function is checking for the reserved term to determine if it ought to redirect. When the page number doesn't exist it redirects to the first page.

For the purpose of your code, you will need to change the page query string parameter to use a term that is not reserved, eg myplugin_page.

As page is a reserved term used for WordPress Core, I'm going to close this ticket as wontfix. It's not the most friendly term, sorry, but in this case it's because WordPress can't easily figure out if a reserved term should be preserved for a plugin.