CONNECTION
To get current query_id from connection
curl -X GET http://fe_host:fe_http_port/api/connection?connection_id=123
If connection_id does not exist, return 404 NOT FOUND ERROR
If connection_id exists, return last query_id belongs to connection_id
{
"query_id" : 9133b7efa92a44c8-8ed4b44772ec2a0c
}