How does typecho determine a 404 page?

Typecho can use the is syntax to determine the page, such as $ this-& amp; gt; is (& #039; page & #039;); how can I determine the 404 page? Typecho can use the is syntax to determine the page, for example, $ this-> is ('page'); how can I determine the 404 page?

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Typecho can use the is syntax to determine the page, for example, $ this-> is ('page'); how can I determine the 404 page?

I don't understand what your point is?
Do you want to throw a 404 page?

Throw new Exception ("Path 123 not found", 404 );