HTTP response status codes indicate whether a specific HTTP request has been successfully completed. Responses are grouped in five classes:
| Status Code | What it is for | Example status code | Example code meaning |
| 1xx | Informational | 100 | 100 = Continue |
| 2xx | Success | 200 | 200 = OK |
| 3xx | Redirection | 307 | 307 = Temporary Redirect |
| 4xx | Client Error | 404 | 404 = Not Found |
| 5xx | Server Error | 500 | 500 = Internal Server Error |
