Describe the problem that you experienced

Non-existent pages, e.g. https://angular.dev/this-page-does-not-exist, are expected to return 404 http status. Instead, all bad URLs return http 200 and dynamically inject the 'page not found' message to the user.

The incorrect 200 status code informs web crawlers that the requested page is valid. The lack of actual useful content on that page might negatively affect ranking as those pages will be deemed to not have any relevant content on them.

The incorrect 200 status code makes it difficult to detect broken links, incl. those internal to the site. As an example, this issue was discovered while diagnosing broken page,https://angular.dev/api/animations/%C9%B5AnimationGroupPlayer (see #56850).

EXPECTED:

• Non-existent page returns http 404 status code

ACTUAL:

• Non-existent page returns http 200 status code

Enter the URL of the topic with the problem

https://angular.dev/api/animations/%C9%B5AnimationGroupPlayer

Describe what you were looking for in the documentation

No response

Describe the actions that led you to experience the problem

No response

Describe what you want to experience that would fix the problem

No response

Add a screenshot if that helps illustrate the problem

No response

If this problem caused an exception or error, please paste it here

No response

If the problem is browser-specific, please specify the device, OS, browser, and version

No response

Provide any additional information here in as much as detail as you can

No response