通过网络套接字发送在Play框架中创建的JSON

Question

That is what I get in browser console:

WS-PARSER: received {"eventPhase":2,"origin":"","bubbles":false,"defaultPrevented":false,"srcElement":{"binaryType":"blob","extensions":"","url":"ws://localhost:9000/map-socket/a@a.com","bufferedAmount":0,"readyState":1,"onerror":null,"onopen":null,"onclose":null,"protocol":"","URL":"ws://localhost:9000/map-socket/a@a.com"},"type":"message","returnValue":true,"target":{"binaryType":"blob","extensions":"","url":"ws://localhost:9000/map-socket/a@a.com","bufferedAmount":0,"readyState":1,"onerror":null,"onopen":null,"onclose":null,"protocol":"","URL":"ws://localhost:9000/map-socket/a@a.com"},"source":null,"cancelable":false,"currentTarget":{"binaryType":"blob","extensions":"","url":"ws://localhost:9000/map-socket/a@a.com","bufferedAmount":0,"readyState":1,"onerror":null,"onopen":null,"onclose":null,"protocol":"","URL":"ws://localhost:9000/map-socket/a@a.com"},"ports":[],"timeStamp":1341430631884,"lastEventId":"","cancelBubble":false,"data":"{\"stars\":[{\"x\":\"0.0\",\"y\":\"0.0\",\"own\":\"-1\",\"id\":\"0\",\"units\":\"0\"},{\"x\":\"0.0\",\"y\":\"0.0\",\"own\":\"-1\",\"id\":\"1\",\"units\":\"0\"},{\"x\":\"0.0\",\"y\":\"0.0\",\"own\":\"0\",\"id\":\"2\",\"units\":\"0\"}]}"}

I have 2 questions:

1) Why does the first part of the message (automatic) has that many header repetitions? Is this ok, should I leave it like that or can I somehow reduce the amount of the boilerplate?

2) Why are all the quotes in the second part of the message (my payload) escaped?

Here is the code that formulates the JSON:

val stars = strs.getAll.map(_.asJsValue).toSeq
Json.toJson(
    Map(
        "stars" -> stars
        )
)

the asJsValue method:

  def asJsValue = {
    Json.toJson(
        Map(
            "id" -> id.toString,
            "x" -> x.toString,
            "y" -> y.toString,
            "units" -> units.toString,
            "own" -> getOwnerID.toString
        )
    )
  }

and on the client side:

websocket.onmessage = receivedEvent

receiveEvent = (event) ->
  console.log("WS-PARSER: received " + JSON.stringify(event))

Answer 1

1. Most of that data is added on the client-side, only the data value is sent over the wire
2. JSON requires double quotes, that's why they are escaped

(disclaimer: not a play user)