Did the duplicate requests come from some external service?

Duplication of requests from an external service can occur for various reasons: for example, due to repeated attempts to send requests during timeouts, errors in client logic, or network issues. To confirm that the duplication is indeed from an external service, it is necessary to analyze incoming request logs, check for unique request identifiers (if available), and compare with client behavior. In Java applications, idempotent operations or deduplication mechanisms are often used to prevent processing the same requests multiple times.