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eryao/docs/protocols/common/http-error-codes.md
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# HTTP Error Codes
This document is the source of truth for backend RFC7807 `code` values consumed by frontend.
## Auth
| code | status | meaning | frontend handling |
|---|---:|---|---|
| `AUTH_SERVICE_UNAVAILABLE` | 503 | Auth upstream unavailable | Show retry message and allow retry |
| `AUTH_TOO_MANY_REQUESTS` | 429 | OTP request throttled | Show wait message |
| `AUTH_VERIFICATION_CODE_INVALID` | 401 | Invalid OTP code | Prompt user to re-enter code |
| `AUTH_REFRESH_TOKEN_INVALID` | 401 | Invalid/expired refresh token | Clear local session and return login |
| `AUTH_REFRESH_TOKEN_MISSING` | 401 | Refresh token missing on logout | Treat as local logout and clear session |
| `AUTH_USER_NOT_FOUND` | 404 | User not found | Show not-found message where applicable |
Compatibility strategy:
- Additive changes only for new codes.
- Existing codes must keep semantic meaning.
- Frontend must map by `code`, not by `detail` text.