This resource opens a WebSocket channel that will be used to send Event Reports to the client.
See [RFC6455] for details on the WebSocket protocol.
6.9.10.1 Request
The request message shall be formed as follows:
Resource
{+WSSERVICE}/subscribers/{AETitle}
where
{+WSSERVICE} is the base URL for the WebSocket service. This shall include the WebSocket protocol (either WS or WSS) and may include a combination of authority and path
{AETitle} identifies the subscribed Application Entity.