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Documentation Grafana k6 JavaScript API k6/experimental websockets WebSocket WebSocket.ping()

WebSocket.ping()

Send a ping. You can use ping messages to verify that the remote endpoint is responsive.

Example

A k6 script that initiates a WebSocket connection, sends a ping, and closes it using the onopen handler. The console should log connection is alive, since the recipient should automatically emit the pong event.

JavaScript

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import { WebSocket } from 'k6/experimental/websockets';

export default function () {
  const ws = new WebSocket('ws://localhost:10000');

  ws.onopen = () => {
    console.log('WebSocket connection established!');
    ws.ping();
    ws.close();
  };

  ws.onpong = () => {
    // As required by the spec, when the ping is received, the recipient must send back a pong.
    console.log('connection is alive');
  };
}

The preceding example uses a WebSocket echo server, which you can run with the following command:

bash

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$ docker run --detach --rm --name ws-echo-server -p 10000:8080 jmalloc/echo-server