It often happens. Someone gets a URL wrong or a file is removed and it ends up people are sent to pages that don't exist. This tool checks if your website is doing the right thing by returning a 404 Missing Page status code when this happens.
Ensuring your website responds to requests correctly can be very important. Especially with SEO and the way you redirect requests to a new page. This tool checks the responses you are sending so you can make sure your doing the right thing.