[wp-trac] [WordPress Trac] #58353: Plain Permalinks do not 404 on paths

[WordPress Trac]

#58353: Plain Permalinks do not 404 on paths
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 Reporter:  timspratt     |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Permalinks    |    Version:  6.2.1
 Severity:  normal        |   Keywords:
  Focuses:                |
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 When permalinks is set to use the URL path, such as "day and name",
 navigating to a path that shouldn't exist, like /foo, throws a 404 - which
 is expected.

 When changing the permalinks to "plain" (?p=1), navigating to /foo shows
 the homepage. Should this not follow suit and throw a 404? Otherwise it
 will lead to pages with duplicate content, since no canonical is set to
 the homepage on the /foo page (which is showing the content of the
 homepage).

 No plugins are installed on my test. It is a fresh install with the only
 change being the permalinks options set to "plain".

 Thanks

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Ticket URL: <https://core.trac.wordpress.org/ticket/58353>
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