AWS ALB - AWS Lambda handler (Python)

index.py

import json

def lambda_handler(event, context):
    name = get_name(event)  # extract inputs
    message = get_message(name)  # business logic
    return build_response(message)  # format output for ALB

def get_name(event):
    # fetch inputs from event (could be missing)
    return event['queryStringParameters'].get('name')

def get_message(name=None):
    # my business logic
    return "Hello %s!" % (name or 'world')

def build_response(message):
    # build response for ALB
    return {
        "statusCode": 200,
        "statusDescription": "200 OK",
        "isBase64Encoded": False,
        "headers": {
            "Content-Type": "application/json",
        },
        "body": json.dumps({"message": message})
    }