Manifest Script Specifics Print

A manifest script should return a JSON formatted as follows:

{
    "ManifestUrl" : "[manifest url]",
    "Cdn" : [
        {
            "Name": "akamai",
            "ManifestUrl": "http://..."
        }
    ],
    "Headers": {
        "manifest": {
            "user-agent": "mozilla/5.0 ...",
            "custom-header": "value"
        },
        "media": {
            "user-agent": "mozilla/5.0 ...",
            "custom-header": "value"
        }
    },
    "Heartbeat": {
        "Url" : "[heartbeat url]",
        "Params": "[param1,param2,...]",
        "PeriodMs" : 300000
    }
}