I have now encountered multiple 404 pages, mostly for since-removed GitHub repositories. It would be nice to have a way to "report" these, so a quick request to check the response code can be sent, and the respective link be removed from the index. This way all users profit from it. It could also reasonably be used to "pause" results for a website on a connection error, or deleting all records of the page on a domain-not-found result.
Adding an element to the result's dropdown seems like a reasonably easy thing to do.
