Fixing AWS Lambda 504 Gateway Timeout Errors 6 Apr 2026 Post a Comment You triggered an AWS Lambda function via API Gateway, but your client receives a 504 Gateway Timeout error after 29 seconds. This happens because API Gateway enforces a strict 29-second maximum int… API Gateway 504asynchronous LambdaAWS LambdaLambda timeout fixserverless architectureSQS worker pattern