Custom format for request and response with or without @class

[enflout]

When I send request it looks like (Google Chrome Console) :

42/v1/user,["currentPerson",{"transactionId":"53445t-53454-534543-53453435"}]

where 53445t-53454-534543-53453435 - is unique transactionId which I automatically include in request and each response.

The response looks like

42/v1/user,["currentPerson","53445t-53454-534543-53453435",{"id":5,"firstName":"Ivan"}]

where /v1/user - namespace with versioning;

1. What is the 42?
2. I want such kind of response

{
    "transactionId": "53445t-53454-534543-53453435",
    "namespace": "/v1/user",
    "event": "currentPerson",
    "person": {
        "id": 5,
        "firstName": "Ivan"
    }
}

3. And such kind of request

{
    "transactionId": "53445t-53454-534543-53453435",
    "namespace": "/v1/user",
    "event": "currentPerson"
}

Now I use socket-io js client but only for test purposes, service will be used with using some C++ library, so I need to use not the socket.io style format.

Is it possible? What methods can I use?

I have found addJsonObjectListener method and sendJsonObject, but I also don't want to pass a @Class directive, it seems weird to me to give client a knowledge about server class hierarchy (package prefix is okay). I just want define some object on the client and parse it manually on the server, then pass manually formed json to the client.

P.S.: By the way Configuration.jsonTypeFieldName is not available now, so @Class now is the only option of name.