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# manualSetProxyUrl

> Manually set the proxy URL base for webhook callbacks.

[ref-agentbase]: /docs/server-sdks/reference/typescript/agents/agent-base

Manually set the proxy URL base used when constructing webhook callback URLs in the
SWML document. Use this when your agent is behind a reverse proxy, tunnel, or load
balancer and the auto-detected URL is incorrect.

> **Tip**
>
> You can also set the `SWML_PROXY_URL_BASE` environment variable for the same effect
> without calling this method.

## **Parameters**

**`url`** `string` — required

The external-facing base URL (e.g., `"https://abc123.ngrok.io"`). Trailing
slashes are automatically stripped.

---

## **Returns**

[`AgentBase`][ref-agentbase] -- Returns `this` for method chaining.

## **Example**

```typescript {5}
import { AgentBase } from '@signalwire/sdk';

const agent = new AgentBase({ name: 'support', route: '/support' });
agent.setPromptText('You are a helpful assistant.');
agent.manualSetProxyUrl('https://abc123.ngrok.io');
await agent.serve();
```

> Manually set the proxy URL base for webhook callbacks.