po:订单号
num：提取数量
proxyType:代理类型,支持http/https/socks5
dataType：返回的数据格式，支持json
province：省份id，此参数可以为空，则不指定省份
city：城市id，此参数可以为空，则不指定城市
username：用户名
                                      

{
    "errcode": "0",
    "msg": "错误代码描述",
    "data": [
        {
            "connip": "s1.xx.com",
            "port": "9088",
            "ip": "1.1.1.1",
            "expiretime": "2018-06-21 10:20:22",
            "remainsec": "186",
            "province": "xx省",
            "city": "xx市"
        },
        {
            "connip": "s2.xx.com",
            "port": "9088",
            "ip": "1.1.1.2",
            "expiretime": "2018-06-21 10:22:05",
            "remainsec": "262",
            "province": "xx省",
            "city": "xx市"
        }
    ]
}