`404 Not Found` error.
| 220 | |
| 221 | |
| 222 | class _NotFound(HTTPError): |
| 223 | """`404 Not Found` error.""" |
| 224 | |
| 225 | message = "not found" |
| 226 | |
| 227 | def __init__(self, message=None): |
| 228 | status = "404 Not Found" |
| 229 | headers = {"Content-Type": "text/html; charset=utf-8"} |
| 230 | HTTPError.__init__(self, status, headers, message or self.message) |
| 231 | |
| 232 | |
| 233 | def NotFound(message=None): |