Websocket - Should client send ping frames?

Question

As the title suggests, should Ping Frames only be sent from a server or it is better to have both endpoints send them? As mentioned in the Websocket RFC:

NOTE: A Ping frame may serve either as a keepalive...

So by by having one endpoint sending a ping request it should keep the connection open, right?

The second part of above line is this:

or as a means to verify that the remote endpoint is still responsive.

I'm new to the concept of websockets but if the connection closes from the server won't the client be notified?

Answer 1

Both variants has ways of implementation. For example in case if server sends ping to client, then client can get information that server disconnected by have a loop with deadline timer which is reset every time when ping is received. If the timer reaches dealine, then it's mean that server disconnected.