handle ping/pong in ws

[hosseinhojjatyar]

hi,
how handle ping/pong in ws?
i can't find an example in https://github.com/uNetworking/uWebSockets.js/tree/master/examples

[hst-m]

v19 automatically sends Ping to client before the idleTimeout to keep connection alive, or you can manually send Ping with ws.ping()

Sending Ping from server: websocket.html#ping
Receiving Ping event: websocketbehavior.html#ping
Receiving Pong event: websocketbehavior.html#pong

[buildscientist]

@hst-m
Does the websocket.ping() method override default behavior for server side pings in v19.x? I want to be able to add some timing metrics for latency measurement between my UWS server and the client responding to ping event.

[e3dio]

Calling ws.ping() on the server will make the client send Pong back, Pong handler will trigger on server so you can add your latency measurement there, receiving the pong will reset the idleTimeout and prevent server from auto-sending ping to client. You can also set ws option sendPingsAutomatically to false if you don't want it auto-sending pings at idleTimeout. Docs need to be updated with the extra options

[lewispham]

@e3dio As mentioned in the docs, why do we need to specify a number instead of a boolean value for sendPingsAutomatically? When that option is enabled, how and when will the pings be sent?

[e3dio]

Docs need to be fixed, see #694

[dragonbane0]

@hst-m Thank you a lot for all these little snippets btw. Helps a lot starting out :)