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Any solution to this can be a problem, you can't just ignore everything after the ? Imagine a blog post with this URL: myblog.com/?post=152 Many websites depend on what follows after the ? to display different content, even hubski a few months ago used to do that. But I agree that a method to compare URL similarities is a good idea. I think this method should warn the user about previous posts or give them a list of similar URLs, ultimately the user will have to make the decision of posting that URL based on manual comparison with the list of similar URLs.