log_format main escape=json '{ "@timestamp": "$time_iso8601", '
            '"remote_addr": "$remote_addr",'
            '"costime": "$request_time",'
            '"realtime": "$upstream_response_time",'
            '"status": $status,'
            '"x_forwarded": "$http_x_forwarded_for",'
            '"referer": "$http_referer",'
            '"request": "$request",'
            '"upstr_addr": "$upstream_addr",'
            '"bytes":$body_bytes_sent,'
            '"dm":$request_body,'
            '"agent": "$http_user_agent" }';

   access_log /var/log/nginx/access.log main;

{
  "results":[
    {
   "price":{
        "pricePerMessage":0.01,
        "currency":"aaa"
      },
      "messageId":"ff4804ef-6ab6-4abd-984d-ab3b1387e852",
      "to":"385981178",
      "sentAt":"2015-02-12T09:58:20.323+0100",
      "doneAt":"2015-02-12T09:58:20.337+0100",
      "smsCount":1,
      "status":{
        "id":5,
        "groupId":3,
        "groupName":"DELIVERED",
        "name":"DELIVERED_TO_HANDSET",
        "description":"Message delivered to handset"
      },
      "error":{
        "groupId":0,
        "groupName":"OK",
        "id":0,
        "name":"NO_ERROR",
        "description":"No Error",
        "permanent":false
      }
    }
  ]
}