| 200 | OK | API called successfully (function execution may still fail) |
| 400 | BAD_REQUEST | The request URL contains blacklisted keywords, or missing validate-appkey / validate-timestamp headers |
| 403 | FORBIDDEN | Host invalid, tenant disabled, time window expired, IP not in whitelist, signature verification failed, or AppKey unauthorized |
| 405 | METHOD_NOT_ALLOWED | Host header is null |
| 429 | TOO_MANY_REQUESTS | Rate limit exceeded |
| 500 | INTERNAL_SERVER_ERROR | Client IP missing, domain not found, or tenant domain info unavailable |
| 502 | BAD_GATEWAY | Unknown error occurred |
| 503 | SERVICE_UNAVAILABLE | Downstream service not found or temporarily unavailable |