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When the API gateway sends a request to the underlying service, the AK/SK must be used to sign the request. For details, see the API Request Signing Guide.
If an error code starting with APIGW is returned after you call an API, rectify the fault by referring to the instructions provided in API Gateway Error Codes.
The server acting as a gateway or proxy has received an invalid request from a remote server. 503 ServiceUnavailable The requested service is invalid.