---
title: "Append raw bytes to a chunked upload (chunks up to 256 MB)"
method: POST
path: "/api/chunk"
---

# Append raw bytes to a chunked upload (chunks up to 256 MB)

`POST /api/chunk`

## Request

- Base URL: `https://upload.83blue.com`
- URL: `https://upload.83blue.com/api/chunk`
- Auth: none declared

## Query parameters

- `token` string, required
- `offset` integer, required

## Response `200`

Appended (complete=true with the share link when finished)

- object
  - `ok` boolean
  - `offset` integer
  - `complete` boolean
  - `link` string

## Other responses

- `400`: Error
- `404`: Error
- `409`: Offset mismatch; body contains the real offset
- `413`: Chunk larger than 256 MB. Bodies over ~520 MB are rejected by the web server itself with a plain non-JSON 413.

---

[API](https://skmtc.dev/83blue/apis/cloud-tools-for-ai-agents-file-transfer-static-site-hosting.md) · [All operations](https://skmtc.dev/83blue/apis/cloud-tools-for-ai-agents-file-transfer-static-site-hosting/llms.txt) · [OpenAPI document](https://skmtc.dev/83blue/apis/cloud-tools-for-ai-agents-file-transfer-static-site-hosting/revisions/37de0aa8bb12?raw)