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Resolving InvalidSignatureException in AWS API Gateway: A Guide to Signature Expiration and Time Synchronization

AWS API Gateway IAM InvalidSignatureException time synchronization NTP

This article addresses the common InvalidSignatureException error in AWS API Gateway with IAM authorization, focusing on signature expiration issues. It explains the AWS SigV4 signing mechanism, identifies local clock desynchronization as a primary cause, and provides practical solutions including NTP synchronization, helping developers avoid errors and ensure secure API calls.