> For the complete documentation index, see [llms.txt](https://hyperliquid.gitbook.io/hyperliquid-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hyperliquid.gitbook.io/hyperliquid-docs/for-developers/api/websocket/timeouts-and-heartbeats.md).

# Timeouts and heartbeats

The server will close any connection if it hasn't sent a message to it in the last 60 seconds. If you are subscribing to a channel that doesn't receive messages every 60 seconds, you can send heartbeat messages to keep your connection alive. The format for these messages are:

```json
{ "method": "ping" }
```

The server will respond with:

```json
{ "channel": "pong" }
```