Package lambda provides the runtime interface for AWS Lambda functions written in Go. This package handles communication with the Lambda execution environment, including receiving invocation events, managing context, and returning responses. Use lambda.Start() to register your handler function and begin processing Lambda invocations. See https://docs.aws.amazon.com/lambda/latest/dg/golang-handler.html Handlers can return io.Reader to stream response data. This example uses a pipe to send data in chunks with delays. See https://docs.aws.amazon.com/lambda/latest/dg/configuration-response-streaming.html