"If Amazon S3 detects that an object has been lost any subsequent requests for that object will return the HTTP 405 ("Method Not Allowed") status code. Your application can then handle this error in an appropriate fashion. If the object lives elsewhere you would fetch it, put it back into S3 (using the same key), and then retry the retrieval operation. If the object was designed to be derived from other information, you would do the processing (perhaps it is an image scaling or transcoding task), put the new image back into S3 (again, using the same key), and retry the retrieval operation."