---
title: "Head Resumable"
method: HEAD
path: "/api/files/resumable/{op_id}"
tags: ["Files"]
---

# Head Resumable

`HEAD /api/files/resumable/{op_id}`

## Request

- Base URL: `https://api.agentstack.tech` (the document declares no server; this is the origin it was published from)
- URL: `https://api.agentstack.tech/api/files/resumable/{op_id}`
- Auth: one of:
  - API key in header `X-API-Key`
  - HTTP bearer

Return ``Upload-Offset`` / ``Upload-Length`` for an in-flight op.

Missing op → 404 (client treats as offset=0). Present op → 200 with
headers so the client can resume exactly where it left off, which is the
whole point of the tus-lite protocol.

## Path parameters

- `op_id` string, required

## Response `200`

Successful Response

- unknown

## Other responses

- `400`: Bad Request
- `401`: Unauthorized
- `403`: Forbidden
- `404`: Not Found
- `409`: Conflict
- `422`: Validation Error
- `429`: Too Many Requests
- `500`: Internal Server Error

---

[API](https://skmtc.dev/agentstack/apis/agentstack-core-api.md) · [All operations](https://skmtc.dev/agentstack/apis/agentstack-core-api/llms.txt) · [OpenAPI document](https://skmtc.dev/agentstack/apis/agentstack-core-api/revisions/8ecf3406e74a?raw)