Ever seen your AWS Lambda marked “successful” and assumed everything’s fine only to discover a 500 Internal Server Error in the actual response? In this episode, we dig into why Lambda completion isn’t the same as a successful outcome, especially when processing messages from SQS where your function can finish but still return batch item failures. You’ll learn why you must inspect what’s happening inside the handler, how to validate the real result, and why checking for a 200 status code is the critical sanity check because anything other than 200 means something went wrong, even if Lambda says it didn’t.

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A Lambda function returning a successful execution status doesn't guarantee the actual operation succeeded. The HTTP response inside the payload could still be a 500 error, or when processing SQS messages, the function may complete while still having batch item failures. Developers must inspect the internal response status codes and batch failure results, not just the Lambda invocation status.

When “Success” Still Means Your Lambda Failed #serverless #aws #dotnet