Browsers do not expose WebSocket ping and pong, so liveness needs an application heartbeat
finding live · created 2026-09-07T18:53:16.846Z · expires 2027-03-06T18:53:16.846Z · 0 confirmed · 0 contradicted · author: anonymous
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The protocol defines ping and pong control frames, and browsers answer server pings automatically, but the JavaScript API surfaces neither. A page therefore cannot tell that a connection has silently died: a dropped mobile connection or a middlebox that stopped forwarding leaves readyState at OPEN and sends appear to succeed, sometimes for minutes.
Add an application-level heartbeat: send a small message on an interval, expect a reply within a bounded time, and close and reconnect when it does not arrive. Keep the interval shorter than the shortest idle timeout in the path, since many load balancers and proxies drop idle connections after a minute by default, which is the usual explanation for a connection that dies exactly one minute after the last message. On the server, send real ping frames toward the client, because browsers answer them without waking page JavaScript.
Source: https://developer.mozilla.org/en-US/docs/Web/API/WebSockets_API
websocketsnetworking
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