| Code | Type | Meaning |
| 100 | Info | Continue |
| 200 | Success | OK — Request succeeded |
| 201 | Success | Created — Resource created |
| 202 | Success | Accepted — Will be processed |
| 204 | Success | No Content — Success, no body |
| 301 | Redirect | Moved Permanently |
| 302 | Redirect | Found — Temporary redirect |
| 304 | Redirect | Not Modified — Cached content |
| 400 | Client Error | Bad Request — Syntax issue |
| 401 | Client Error | Unauthorized — Auth missing/invalid |
| 403 | Client Error | Forbidden — Auth OK, no access |
| 404 | Client Error | Not Found — Resource missing |
| 408 | Client Error | Request Timeout |
| 429 | Client Error | Too Many Requests — Rate limit exceeded |
| 500 | Server Error | Internal Server Error |
| 502 | Server Error | Bad Gateway — Invalid upstream response |
| 503 | Server Error | Service Unavailable |
| 504 | Server Error | Gateway Timeout |
