def lambda_handler(event, context):
    ret = {
        'statusCode': 440,
        'headers': { 'content-type': 'application/json', 'x-custom-hdr': 'A value!', 'Set-Cookie': ['k=v', 'k2=v2'] },
        'body': json.dumps('This is my response from Lambda.')
    }
    return ret