Hi, it looks like the second URL must be from a custom or third party extension that's been installed. Presumably it's used somewhere around the site to load in product information via ajax (i.e. without needing to reload the page), perhaps in a modal/lightbox window somewhere?
There are a few ways around:
- Enable canonical URLs and add a canonical URL on ajax URLs pointing to the correct product URL
- Make the AJAX url only respond via POST and updating the code that makes requests to this URL.
- If you're worried about Google indexing the ajax URLs then a line can be added to the robots.txt to Disallow anything beneath /ajax/.
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