Fixing the .html.html url problem in Magento
A while ago we took over a Magento 1 shop that was migrated over to Magento 2. Some products and categories has a “.html.html” url postfix and the merchant wanted to have this fixed. When data was migrated from Magento 1 shop, the url keys came with ".html" suffix. On Magento 2, you have url_key and url_path attributes that help creating the urls for products and categories. Since the url_key attribute contained the “.html” postfix and url_path appended an additional “.html” postfix, the source of the problem was found.