: CodeIgniter's code sounds actually quite good for usability - if it can't find a page, it takes you to the category where that page is likely to be rather than returning nothing. Pages

@Kevin317

CodeIgniter's code sounds actually quite good for usability - if it can't find a page, it takes you to the category where that page is likely to be rather than returning nothing.

Pages you have knowingly changed the URL of are better 301d rather than 404d so they go to exactly the right page.

The only potential duplicate content problem here is if Google accidentally index the wrong version of a page. They could only do that if any links are pointing to the wrong URL. It is not going to be treated any more a new page than the fact that every site on the web can have new duplicate pages by appending a parameter to the URL. They are usually pretty good at recognising which URL is canonical. If not, help them out with a canonical tag.

(If you really need to change the routing rules, then a Google tells me they are set at application/config/routes.php - though make sure you follow any override guidelines instead of hacking at core code)

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