time	N	string
sign	Y	string

success
{
    "status":200,
    "serverList":[
         {"serverName":"Server 1","serverId":"1000001"},
         {"serverName":"Server 2","serverId":"1000002"},
         {"serverName":"Server 3","serverId":"1000003"},
         {"serverName":"Server 4","serverId":"1000004"}
    ] ，
    " error ":"",
}
error
{
    "status": 201, 
    "serverList": "",
    "error": 
}