# Stream an incident's timeline

`GET https://evohub.io/api/v1/incidents/{id}/sse`

Part of the [On-Call API](https://docs-dev.evohub.io/oncall.md) reference · operationId `streamIncidentTimeline`.

A Server-Sent Events stream of new entries added to the incident's timeline
with the timeline endpoint. It opens with `: connected` and sends
`: keep-alive` every 25 seconds. Each event is one `data:` line:

```
data: {"type":"timeline_entry","incident_id":"…","entry_id":"…","author_id":"…","status":"investigating","message":"…","org_id":"…"}
```

Status changes and edits are not streamed; re-read the timeline after
reconnecting.

**Permission (API-key scope):** `oncall:incident:read`.

## Authorization

Any one of:

- `bearerAuth` (oncall:incident:read)
- `apiKeyHeader` (oncall:incident:read)

Where:

- `bearerAuth`: HTTP Bearer — An EvoHub API key (`evohub_…`) as a bearer token.
- `apiKeyHeader`: API key in the header `X-API-Key` — An EvoHub API key (`evohub_…`).

## Path parameters

- `id` (string, required, example `2e7f9a1b-3c4d-4e5f-8a9b-0c1d2e3f4a5b`): The incident's id.

## Responses

### 200 — The event stream.

Content type: `text/event-stream`

Type: `string`

### 401 — No API key was sent, or it is unknown, revoked or expired (`UNAUTHORIZED`).

Content type: `application/json`

Type: `Error`

- `error` (object, required)
  - `code` (string, required): Machine-readable code. Branch on this.
  - `message` (string, required): Human-readable explanation.

### 403 — The key lacks the scope this endpoint needs (`FORBIDDEN`).

Content type: `application/json`

Type: `Error`

- `error` (object, required)
  - `code` (string, required): Machine-readable code. Branch on this.
  - `message` (string, required): Human-readable explanation.

### 429 — Too many requests (`RATE_LIMITED`). Wait `Retry-After` seconds.

Headers:

- `Retry-After` (integer): Seconds to wait.

Content type: `application/json`

Type: `Error`

- `error` (object, required)
  - `code` (string, required): Machine-readable code. Branch on this.
  - `message` (string, required): Human-readable explanation.

### 500 — Something went wrong on EvoHub's side (`INTERNAL_ERROR`). Retry later.

Content type: `application/json`

Type: `Error`

- `error` (object, required)
  - `code` (string, required): Machine-readable code. Branch on this.
  - `message` (string, required): Human-readable explanation.

### 503 — Streaming is not available right now (plain-text body).

## Example request

```bash
curl -X GET 'https://evohub.io/api/v1/incidents/2e7f9a1b-3c4d-4e5f-8a9b-0c1d2e3f4a5b/sse' \
  -H 'Authorization: Bearer <TOKEN>'
```