NATS Websocket connection in the browser randomly gets closed. Ping sent after 1 minute even with pingInterval: 25seconds.

[tehseensajjad-sys]

Observed behavior

Our frontend application is moving to replace inhouse websocket server with NATS Websocket. All seems good except the nats websocket connection is randomly getting closed and a new one is created. In firefox the error code mentioned is Closed 1006. pingInterval is set to 25 seconds to keep the connection from idling but i noticed in some instances a ping is sent after a whole minute, thus browser closes the connection.

You can notice the last ping sent after 60 second after which the connection is closed by the browser,

Expected behavior

Nats websocket connection should remain open and pings should be sent consistently

Server and client version

nats-server: v2.10.22
nats.ws: v1.29.2
Browsers tested: Chrome, Firefox, Safari

Host environment

3 node nats cluster runs in Kubernetes behind an AWS NLB.
TLS is terminated by APISIX gateway route.
Socket endpoint is wss://
Client runs in the browser.

Steps to reproduce

import {
  connect,
} from "nats.ws";

const natsConnection = await connect({ 
  servers: WSS_SOCKET_URL,
  name: `web-client`,
  pingInterval: 25000,
});

natsConnection.closed()
  .then((err) => {
    console.log(
      `connection closed ${err ? " with error: " + err.message : ""}`,
    );
  });