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# manualSetProxyUrl

> Manually set the proxy URL base for webhook callback generation.

Manually set the proxy URL base used for generating webhook callback URLs.
Call this when automatic proxy detection does not work for your deployment
(e.g., behind a custom load balancer or tunneling service).

Overrides any value auto-detected from the `SWML_PROXY_URL_BASE` environment
variable or inferred from request headers, and clears the "from env" flag so
subsequent env changes won't overwrite your explicit setting.

> **Note**
>
> The proxy URL affects how webhook URLs are generated for SWAIG function
> callbacks, post-prompt URLs, and other webhook endpoints. Without a correct
> proxy URL, SignalWire cannot reach your service's webhook endpoints when
> deployed behind a reverse proxy or tunnel.

## **Parameters**

**`url`** `string` — required

The base URL to use for webhook generation (e.g., `"https://my-agent.ngrok.io"`).
Trailing slashes are stripped automatically. Empty strings are ignored.

---

## **Returns**

`this` -- returns the service for fluent chaining.

## **Example**

```typescript {6}
import { SWMLService } from '@signalwire/sdk';

const service = new SWMLService({ name: 'my-service' });

// Set proxy URL for ngrok tunnel
service.manualSetProxyUrl('https://abc123.ngrok.io');

service.addVerb('answer', {});
await service.serve();
```

> Manually set the proxy URL base for webhook callback generation.