How do I catch ping/pong frames sent to my ws listener from the server?

Question

The ws package for nodeJS hides incoming ping frames by default and silently responds to them with pong frames.

How can I catch these incoming ping frames and take note of them?

I do not have a node app. The documentation reads *"Pong messages are automatically sent in response to ping messages as required by the spec."* so it's not relevant to my code anyways. — randy, Dec 23 '20 at 03:23

score 1 · Accepted Answer · answered Dec 23 '20 at 03:39

1

You just listen for a ping event: https://github.com/websockets/ws/blob/master/doc/ws.md#event-ping

The real answer here is RTFM.

answered Dec 23 '20 at 03:39

randy

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This event isn't emitted in the browser: https://github.com/websockets/ws/issues/675 – teg_brightly Jan 04 '22 at 18:06

score 0 · Answer 2 · answered Dec 23 '20 at 03:27

You need a Node app for that. The app and your front-end (FE) will have open websockets via which they will communicate.

Conceptually, you run a node server and open a web-socket on it. Then you serve your FE to users. The FE in user's browser opens connection back to the server via the websocket. The server sends/pushes some messages to FE via this open channel, and also the client can send some messages to the app.

The websockets differ from a simple requests in that you can PUSH data to the FE. With simple requests, the FE can only PULL data from the server.

score 0 · Answer 3 · answered May 08 '23 at 23:45

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Per https://github.com/websockets/ws#how-to-detect-and-close-broken-connections

client.on('ping', heartbeat);

answered May 08 '23 at 23:45

Ken Lin

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How do I catch ping/pong frames sent to my ws listener from the server?

3 Answers3