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The server acting as a gateway or proxy has received an invalid request from a remote server. 503 ServiceUnavailable The requested service is invalid.
If no data is transmitted to API Gateway for 300s, the connection will be closed. To prevent this situation, a data packet needs to be periodically sent from the client to maintain persistent connection.
Gateway error code Type Status Code Error Code Description Measure Gateway errors (error code range: 1–400) 404 APIG.0101 The API does not exist. The request address or URL used for calling the API does not exist or has not been released.