Support WebSockets

[tkrotoff]

Should we use https://github.com/sockjs/sockjs-node or the HTML5 API https://developer.mozilla.org/en-US/docs/Web/API/WebSockets_API ?

[tkrotoff]

The data flow between REST APIs (unidirectional) and WebSockets (bidirectionnal) are very different:

• With REST APIs the client fetches the data: always the same simple scenario + the protocol (get, update, delete) & format (JSON) is known in advance
• With WebSockets the protocol/format is unknown and varies: the client can subscribe to topics and then it is the server that sends data to the client

Implementations:

• I'm the client, GET... data. The stub server replies.
• I'm the client, I don't ask anything, just send me relevant WebSockets messages if ? from a WebSockets server
  • OK: I'm the stub-server, please WebSockets server, send this message to the client. How? (protocol/format) and when?

(the client == the user == the browser)

Because of the nature of WebSockets (bidirectional and unknown protocol/format) I don't think it is possible to add support for WebSockets inside stub-server. WebSockets is lower-level compared to REST.