| 404 |
Page Not Found : the page / resource doesn't exist on the server |
| 400 |
Bad Request : host server cannot understand the URL on your page |
| bad host |
Invalid host name : server with that name doesn't exist or is unreachable |
| bad url |
Malformed URL (e.g. a missing bracket, extra slashes, wrong protocol, etc.) |
| bad code |
Invalid HTTP response code : server response violates HTTP spec |
| empty |
Host server returns "empty" responses with no content and no response code |
| timeout |
Timeout : HTTP requests constantly timed out during the link check |
| reset |
Host server drops connections. It is either misconfigured or is too busy. |