It will demonstrate the wide range that is openend by making use
of the power embedded in Node.js and its adapter to Caché, Ensemble, Health,..*
Node / JavaScript have wide reputation to work as a WebSocket client.
By using the Caché adapter it becomes easy to control it and to consume the results as a
Client for WebSocket Servers and to collect the replies in Caché, Ensemble, ..

I used node-v6.16.0-x64.msi and cache610.node as cache.node

You provide a Global for input:

 ^WsockIn="wss://ws.postman-echo.com/raw"
 ^WsockIn(0)=6
 ^WsockIn(1)="Hello"
 ^WsockIn(2)="World !"
 ^WsockIn(3)="Robert"
 ^WsockIn(4)="is waiting"
 ^WsockIn(5)="for replies"
 ^WsockIn(6)="exit"

and with this echo server you get back a Global as output

 ^WsockOut(0)=6
 ^WsockOut(1)="Hello"
 ^WsockOut(2)="World !"
 ^WsockOut(3)="Robert"
 ^WsockOut(4)="is waiting"
 ^WsockOut(5)="for replies"
 ^WsockOut(6)="exit"

you may call it from with class code or routine or command line

  kill ^WsockOut
  do $zf(-1,"node ""C:\Program Files\nodejs\user\WsockDemo""")
  zwrite ^WsockOut

or in verbose mode

  SAMPLES>$node "C:\Program Files\nodejs\user\WsockDemo"

  start
  server:  wss://ws.postman-echo.com/raw
  Lines to process:  6

  WebSocket Client Connected
  client ready

  Line:  1  text:  Hello
  Line:  2  text:  World !
  Line:  3  text:  Robert
  Line:  4  text:  is waiting
  Line:  5  text:  for replies
  Line:  6  text:  exit
  lines sent:  6

  Received: 'Hello'
  Received: 'World !'
  Received: 'Robert'
  Received: 'is waiting'
  Received: 'for replies'
  Received: 'exit'
  replies received:  6

  Client Closed
  SAMPLES>

Using the WebSocket Server in namespace USER

ws://localhost:57772/csp/user/Web.SocketTest.cls

the replies look like this:

Received: 'Welcome to Cache WebSocket. NameSpace: SAMPLES'
Received: ''Hello' (length=5) recieved on 08 Feb 2019 at 02:57:08PM NameSpace=USER'
Received: ''World !' (length=7) recieved on 08 Feb 2019 at 02:57:08PM NameSpace=USER'
Received: ''Robert' (length=6) recieved on 08 Feb 2019 at 02:57:08PM NameSpace=USER'
Received: ''is waiting' (length=10) recieved on 08 Feb 2019 at 02:57:08PM NameSpace=USER'
Received: ''for replies' (length=11) recieved on 08 Feb 2019 at 02:57:08PM NameSpace=USER'
replies received:  6

Client Closed

.
. .
I have to admit this was my first piece of code to run in Node.js.

Article in DC