screenshot with viewport

screenshot_viewport.json

{
    "application_id":"YOUR_APP_ID",
    "src":"http://www.franckreich.de/4/members/detail.html",
    "src_type":"screen_shot_url",
    "src_data": { "viewport" : "480x640"},
    "functions":[
        {
            "name":"no_op",
            "save":{
                "image_identifier":"external_sample_1",
                "extension":"png"
            }
        }
    ]
}