John Mueller said on twitter that if you are using 301 redirect then prior to this be confirmed that you are using it for 1:1 relationship between URL otherwise it will be considered as 404 page.


What is 1:1 relationship?

For instance you have a page for a product ABC and you need to change the URLs then redirect it to new page for the same product ABC then it is called 1:1 replacement or relationship.

But if you the new pages is concerned to some other product ABD then it is not a 1:1 relationship.


Non 1:1 replacement will be treated as 404 page

If Google finds any page which after the changing of URL is not fulfilling the criteria of 1:1 then it will treat it as 404 pages.


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