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    permalinks - Link works although page was moved to another location

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    I am a new to WordPress. Please help me with the following issue.

    I created page A and set Parent to X, hence its permalink was displayed as "http://websitename/index.php/X/A/".

    In page B, I reference to page A by the attaching the link "http://websitename/index.php/X/A/" there

    I then changed Parent of page A from X to Y. The permalink of A thus was updated as: "http://websitename/index.php/Y/A/"

    I visit page B again and click on link "http://websitename/index.php/X/A/", it still works and brings me to link "http://websitename/index.php/Y/A/"

    I wonder how it could happen? I was expecting to see Page Not Found or something like that as link "http://websitename/index.php/X/A/" is no longer available.

    There probably is something I don't know about how the link in WordPress works. Can somebody please help explain this to me? Thanks!

    I am a new to WordPress. Please help me with the following issue.

    I created page A and set Parent to X, hence its permalink was displayed as "http://websitename/index.php/X/A/".

    In page B, I reference to page A by the attaching the link "http://websitename/index.php/X/A/" there

    I then changed Parent of page A from X to Y. The permalink of A thus was updated as: "http://websitename/index.php/Y/A/"

    I visit page B again and click on link "http://websitename/index.php/X/A/", it still works and brings me to link "http://websitename/index.php/Y/A/"

    I wonder how it could happen? I was expecting to see Page Not Found or something like that as link "http://websitename/index.php/X/A/" is no longer available.

    There probably is something I don't know about how the link in WordPress works. Can somebody please help explain this to me? Thanks!

    • permalinks
    Share Improve this question asked Nov 1, 2018 at 15:36 PinckcloudPinckcloud 31 bronze badge
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    1 Answer 1

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    That is called canonical redirect.

    And it's done through redirect_canonical() which basically

    Redirects incoming links to the proper URL based on the site url.

    and

    Will also attempt to find the correct link when a user enters a URL that does not exist based on exact WordPress query.

    (Those excerpts were both taken from the function's reference.)

    So in your case, although the post parent of A has changed from X to Y, the post A (or a post with that slug) still exists, and therefore, when you visit the old URL:

    http://websitename/index.php/X/A/ (old URL - post parent is X)

    with canonical redirect, you'd be redirected to the correct URL:

    http://websitename/index.php/Y/A/ (new URL - post parent is Y)

    and not being presented with a 404 (page not found) error page.

    Try visiting http://websitename/index.php/A/ and you'd see the canonical redirect being applied.

    And if you visit http://websitename/index.php/A123z/, assuming there are no post with A123z as the slug, then you'd see the 404 error page.

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