---
title: "Create Multipart Completion Url"
method: POST
path: "/api/workspace/uploads/multipart/complete-url"
tags: ["runtime_mutations", "workspace-uploads"]
---

# Create Multipart Completion Url

`POST /api/workspace/uploads/multipart/complete-url`

Keep long JuiceFS multipart assembly off the API's response deadline.

## Request body

- MultipartCompleteRequest
  - `relative_path` string, required
  - `upload_id` string, nullable
  - `s3_upload_id` string, required
  - `parts` CompletedPart[], required
    - `part_number` integer, required
    - `etag` string, required

## Response `200`

Successful Response

- MultipartCompleteUrlResponse
  - `relative_path` string, required
  - `url` string, required
  - `headers` object, required
  - `body` string, required
  - `expires_in_seconds` integer, required

## Other responses

- `422` — Validation Error

## Changes

- **2026-09-22** `397ad3a1d858` — 1 info
  - endpoint added

[Change history](https://skmtc.dev/quadrillion/apis/quadrillion-cloud-api/changes/api/workspace/uploads/multipart/complete-url/post.md)

---

[API](https://skmtc.dev/quadrillion/apis/quadrillion-cloud-api.md) · [All operations](https://skmtc.dev/quadrillion/apis/quadrillion-cloud-api/llms.txt) · [OpenAPI document](https://skmtc.dev/quadrillion/apis/quadrillion-cloud-api/revisions/d61e2ec5a271?raw)