# Download video task content

Download video task content. The following is this gateway’s public contract.

## Endpoint and authentication

`GET https://api.tu-zi.com/v1/videos/{task_id}/content`

Transport: json

Use an inference API key. Examples contain placeholders; read credentials from environment variables.

```http
Authorization: Bearer YOUR_API_KEY
```

## Path parameters

| Field | Type | Required | Description / constraints |
| --- | --- | --- | --- |
| task_id | string | Yes | Public task ID returned by this gateway. Example: YOUR_TASK_ID |

## Before running

Replace https://api.tu-zi.com with this site origin (do not append /v1 twice), and YOUR_MODEL with the exact marketplace model ID. Install requests for Python; use Node.js 20+ and save JavaScript as .mjs. WebSocket samples list their own dependencies.

Create an inference key on the site and set API_KEY in the environment; replace YOUR_API_KEY in cURL. Prepare local input.png/input.wav files for upload examples.

Start with a minimal request, then read the result using the response fields below. For async APIs, a returned task ID requires polling; acceptance does not mean generation has finished.

## Code examples

### curl

```bash
curl --request GET 'https://api.tu-zi.com/v1/videos/YOUR_TASK_ID/content' \
  --header 'Authorization: Bearer YOUR_API_KEY' \
  --output 'output.video'
```

### python

```python
import json
import os
import requests

url = "https://api.tu-zi.com/v1/videos/YOUR_TASK_ID/content"
headers = json.loads("{\"Authorization\":\"Bearer YOUR_API_KEY\"}")
headers["Authorization"] = "Bearer " + os.environ["API_KEY"]
response = requests.request("GET", url, headers=headers, timeout=120)
response.raise_for_status()
if "json" in response.headers.get("Content-Type", "").lower():
    raise RuntimeError("Expected binary content, received JSON: " + response.text)
with open("output.video", "wb") as output:
    output.write(response.content)
```

### javascript

```javascript
import { writeFile } from 'node:fs/promises';
// Node.js 20+
const url = "https://api.tu-zi.com/v1/videos/YOUR_TASK_ID/content";
const headers = {
  "Authorization": "Bearer YOUR_API_KEY"
};
headers.Authorization = 'Bearer ' + process.env.API_KEY;
const response = await fetch(url, { method: "GET", headers });
if (!response.ok) throw new Error(await response.text());
if ((response.headers.get("content-type") || "").toLowerCase().includes("json")) throw new Error("Expected binary content, received JSON: " + await response.text());
await writeFile("output.video", Buffer.from(await response.arrayBuffer()));
```

## Response fields

| Field | Type | Description / constraints |
| --- | --- | --- |
| binary | binary | Media bytes on success; do not parse as JSON. |

Illustrative response; some endpoints show essential fields only. Optional fields may be absent.

```json
{}
```

## Errors and retries

Check HTTP status and protocol-specific errors; do not mix error formats across protocols. For 401/403 check credentials and permissions, for 429 back off, and for 5xx check gateway/upstream status. Error bodies may contain error/message/code depending on the protocol.

Use bounded exponential backoff for reads. Do not blindly retry task creation, generation, or key mutations, to avoid duplicate billing or execution.

## Constraints

Use the owning account API key or a valid session. The task must have a successful downloadable result. Handle failures using HTTP status and JSON errors. Allow ordinary redirects without forwarding credentials to untrusted origins.

## Documentation source

Definition version: 1

Reviewed: 2026-11-02

Source: https://api.tu-zi.com/en/docs/api/reference-relay-video-content

This export contains documentation and examples only, without real credentials, account data or user requests.