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chore: Update SDK documentation (#2834)

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---
title: ping
sidebarTitle: ping
---
# `fastmcp.server.middleware.ping`
Ping middleware for keeping client connections alive.
## Classes
### `PingMiddleware` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/middleware/ping.py#L10" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
Middleware that sends periodic pings to keep client connections alive.
Starts a background ping task on first message from each session. The task
sends server-to-client pings at the configured interval until the session
ends.
**Methods:**
#### `on_message` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/middleware/ping.py#L42" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
```python
on_message(self, context: MiddlewareContext, call_next: CallNext) -> Any
```
Start ping task on first message from a session.