GET /tasks/<taskID>
Host: pili-pub.qiniuapi.com
Authorization: <QiniuToken>

200 {
    "taskID": "123",
    "name": "",
    "runType":"seek",
    "sourceUrls": [
        {
            "url":<URL>,
            "isp":<ISP>
        }
    ],           
    "forwardUrls": [
        {
            "url":<URL>,
            "isp":<ISP>
        }
    ],
    "filter": {},
    "status": "",
    "deliverStartTime": 123, 
    "deliverStopTime": 123, 
    "startTime": 123 
    "stopTime": 123 
}

400 {
		"error": "invalid parameter"
}

404 {
    "error": "not fond"
}

500 {
    "error": "query task fail"
}