---
title: "Someone is looking at the preview: postpone its idle shutdown (call about once a minute while it is visible); a stopped preview is reported as stopped"
method: POST
path: "/builder/sessions/{sessionId}/preview/keepalive"
tags: ["Builder"]
---

# Someone is looking at the preview: postpone its idle shutdown (call about once a minute while it is visible); a stopped preview is reported as stopped

`POST /builder/sessions/{sessionId}/preview/keepalive`

## Request

- Base URL: `https://hostingsurge.com/api/v1`
- URL: `https://hostingsurge.com/api/v1/builder/sessions/{sessionId}/preview/keepalive`
- Auth: one of:
  - HTTP bearer
  - API key in cookie `__Host-hs_session`

## Path parameters

- `sessionId` string, uuid, required

## Response `200`

The preview

- object
  - `status` 'starting' | 'running' | 'idle' | 'stopping' | 'stopped' | 'error', required
  - `previewUrl` string, nullable, required
  - `error` string, nullable, required
  - `lastActivityAt` string, required: ISO-8601 timestamp

## Other responses

- `400`: Invalid request (code invalid_request)
- `401`: Missing or invalid session/token (code unauthorized)
- `403`: Authenticated but not permitted, or (details.reason "private_beta") the AI builder is in private beta and not open to this team yet (code forbidden)
- `404`: Not found or not visible to the caller (code not_found)
- `409`: A turn is already running in this session, or the session is archived (code conflict, details.reason turn_running / archived)
- `429`: Too many requests (code rate_limited): the team started its hourly number of turns (details.reason "turn_rate") or the builder reached its capacity for the day (details.reason "daily_budget"); see Retry-After
- `501`: The AI builder is not available on this server right now (code not_configured)

---

[API](https://skmtc.dev/hostingsurge/apis/hostingsurge-platform-api.md) · [All operations](https://skmtc.dev/hostingsurge/apis/hostingsurge-platform-api/llms.txt) · [OpenAPI document](https://skmtc.dev/hostingsurge/apis/hostingsurge-platform-api/revisions/4d08337cdff1?raw)