Function _should_try_fallback

uncommon_route/proxy.py:4965–4970

(status_code: int, content: bytes)

            return _spend_error(check, api_format=api_format, headers=debug_headers)

        def _should_try_fallback(status_code: int, content: bytes) -> bool:
            if not is_virtual or not fallback_models:
                return False
            if status_code in (500, 502, 503, 504):
                return True
            return status_code in (400, 404, 422) and _is_model_error(content)

        def _transport_error_response(exc: httpx.TransportError) -> httpx.Response:
            status_code = 504 if isinstance(exc, httpx.TimeoutException) else 502