| Code | Description |
|---|---|
| 200 OK | succeeded |
| 201 Created | succeeded, and a new resource was created |
| 301 Moved Permanently | the URL of the resource has been changed permanently. |
| 304 Not Modified | the response not been modified |
| 400 Bad Request | invalid request |
| 403 Forbidden | have no access rights |
| 404 Not Found | cannot find the resource |
| 500 Internal Server Error | server does not know how to handle |
| 503 Service Unavailable | server is not ready |