Think beyond the 404 code. : )
Possible "Success" codes are:
200 = Success: OK, 201 = Success: Created, 202 = Success: Accepted, 203 = Success: Partial Information, 204 = Success: No Response, 300 = Success: Redirected, 301 = Success: Moved, 302 = Success: Found, 303 = Success: New Method, 304 = Success: Not Modified
Possible "Failed" codes are
400 = Failed: Bad Request, 401 = Failed: Unauthorized, 402 = Failed: Payment Required, 403 = Failed: Forbidden, 404 = Failed: Not Found, 500 = Failed: Internal Error, 501 = Failed: Not Implemented, 502 = Failed: Overloaded Temporarily, 503 = Failed: Gateway Timeout