> ## Documentation Index
> Fetch the complete documentation index at: https://developers.telnyx.com/llms.txt
> Use this file to discover all available pages before exploring further.

# handleSse()

> **handleSse**(`req`): `Promise`\<`Response`>

Serve the agent's streams as one SSE response (see the class doc for the
URL contract and the event format). The connection is negotiated through
the socket server's own bootstrap: `authorize` resolves the token from
the query string (or an `Authorization` header), `onAttach` may veto, and
the subscribed streams replay their backlog past the `Last-Event-ID`
cursors before live pushes begin. A rejected connection answers with the
error frame as JSON (401 for a rejected credential) instead of a stream.

When the response is torn down — the `EventSource` closed, the request
aborted, the network dropped — the subscription is released immediately:
the connection leaves the watcher set and broadcasts stop targeting it.

**Parameters**

| Parameter | Type | Description |
| - | - | - |
| `req` | `Request` | The inbound GET request. |

**Returns**

`Promise`\<`Response`>

A `text/event-stream` response, or an error response.