wxVisitDistributionResponse

{
    "ref_date": "20170313",
    "list": [
        {
            "index": "access_source_session_cnt",
            "item_list": [
                {
                    "key": 2,
                    "value": 10243
                },
                {
                    "key": 1,
                    "value": 116578
                }
            ]
        }
    ],
    "errMsg": "openapi.analysis.getDailyRetain:ok"
}