Communication with the backend

Envelope structure

{
  "id": "abcdefg", // unique string
  "date": "2001-08-02T10:45:23.5+09:00",
  "replyTo": "192.168.1.2:3334", // optional. the hostname and the listening port of the sender itself
  "inReplyTo": "0123456789", // optional. one-way message don't have this field.
  "statusCode": 200, // compatible to HTTP status code
  "type": "search.result", // "createtable.result", "removetable.result", etc.
  "body": {...}
}

For example, search feature:

• Request's type is "search". The "body" is same to the JSON defined in Message format: search feature.
• Response's type is "search.result". The "body" is same to the JSON defined in Message format: search feature. The id of "inReplyTo" is same to the id of the request message.