Package alb provides adapter enabling usage of http.Handler inside AWS Lambda running behind AWS ALB as described here: https://docs.aws.amazon.com/lambda/latest/dg/services-alb.html Usage example: Note: since both request and reply to/from AWS Lambda are passed as json-encoded payloads, their sizes are limited. AWS documentation states that: "The maximum size of the request body that you can send to a Lambda function is 1 MB. [...] The maximum size of the response JSON that the Lambda function can send is 1 MB." Exact limit of response size also depends on whether its body is valid utf8 or not, as non-utf8 payloads are transparently base64-encoded, which adds some overhead. For further details see https://docs.aws.amazon.com/elasticloadbalancing/latest/application/lambda-functions.html