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# List Harbor Context Versions

GET https://app.polytomic.com/api/harbors/{harbor_id}/contexts/{context_id}/versions

Lists immutable published versions of a Harbor context document without returning content.

Versions are ordered from newest to oldest. Collection items omit `content`,
and the draft is never included. Pagination tokens continue from the last
returned version, so publishing a newer version between requests does not shift
or duplicate older results.

Published revision IDs are durable artifact identities intended for future
Harbor activity and audit records. Publisher IDs are paired with actor types.
System publications have `published_by_type: "system"` and a null
`published_by` because the system actor has no UUID.

A Harbor profile credential can read versions only when `harbor_id` identifies
its own Harbor.

Reference: https://apidocs.polytomic.com/api-reference/harbors/list-context-versions

## Authentication

- `Authorization` header (bearer token, required) — Bearer user API key
- `Authorization` header (basic auth, required) — Basic organization-scoped API key

## Request

### Path parameters

- `harbor_id` (string, required) — Unique identifier of the Harbor.
- `context_id` (string, required) — Unique identifier of the context document.

### Query parameters

- `limit` (integer, optional, default: 50) — Maximum number of published versions to return. Defaults to 50 and cannot exceed 50.
- `page_token` (string, optional) — Opaque pagination cursor returned by the previous request.

### Headers

- `X-Polytomic-Harbor-Session` (string, optional)
- `X-Polytomic-Activity-Request-ID` (string, optional)

## Response

### 200

OK

- `data` (list of HarborContextVersionMetadataResponse, optional, nullable)
- `pagination` (PaginationDetails, optional)

## Errors

### 403 Forbidden Error

Forbidden

- `key` (string, optional)
- `message` (string, optional)
- `metadata` (map from string to any, optional)
- `status` (integer, optional)

### 404 Not Found Error

Not Found

- `key` (string, optional)
- `message` (string, optional)
- `metadata` (map from string to any, optional)
- `status` (integer, optional)

### 422 Unprocessable Entity Error

Unprocessable Entity

- `key` (string, optional)
- `message` (string, optional)
- `metadata` (map from string to any, optional)
- `status` (integer, optional)

### 500 Internal Server Error

Internal Server Error

- `key` (string, optional)
- `message` (string, optional)
- `metadata` (map from string to any, optional)
- `status` (integer, optional)

## Types

### HarborContextVersionMetadataResponse

- `change_note` (string, optional, nullable) — Optional note supplied when this version was published.
- `description` (string, optional) — Description captured in this version.
- `id` (string, optional) — Unique identifier of this published version.
- `published_at` (datetime, optional) — When this version was published.
- `published_by` (string, optional, nullable) — Actor that published this version. Null for system publications.
- `published_by_type` (string, optional) — Type of actor that published this version.
- `title` (string, optional) — Title captured in this version.
- `version` (integer, optional) — Monotonic version number within the context document.

### PaginationDetails

- `next_page_token` (string, optional)

## Examples

**Response**

```json
{
  "data": [
    {
      "change_note": "string",
      "description": "string",
      "id": "248df4b7-aa70-47b8-a036-33ac447e668d",
      "published_at": "2024-01-15T09:30:00Z",
      "published_by": "248df4b7-aa70-47b8-a036-33ac447e668d",
      "published_by_type": "string",
      "title": "string",
      "version": 1
    }
  ],
  "pagination": {
    "next_page_token": "AmkYh8v0jR5B3kls2Qcc9y8MjrPmvR4CvaK7H0F4rEwqvg76K=="
  }
}
```

**SDK Code**

```python
import requests

url = "https://app.polytomic.com/api/harbors/248df4b7-aa70-47b8-a036-33ac447e668d/contexts/248df4b7-aa70-47b8-a036-33ac447e668d/versions"

headers = {"Authorization": "Bearer <token>"}

response = requests.get(url, headers=headers)

print(response.json())
```

```javascript
const url = 'https://app.polytomic.com/api/harbors/248df4b7-aa70-47b8-a036-33ac447e668d/contexts/248df4b7-aa70-47b8-a036-33ac447e668d/versions';
const options = {method: 'GET', headers: {Authorization: 'Bearer <token>'}};

try {
  const response = await fetch(url, options);
  const data = await response.json();
  console.log(data);
} catch (error) {
  console.error(error);
}
```

```go
package main

import (
	"fmt"
	"net/http"
	"io"
)

func main() {

	url := "https://app.polytomic.com/api/harbors/248df4b7-aa70-47b8-a036-33ac447e668d/contexts/248df4b7-aa70-47b8-a036-33ac447e668d/versions"

	req, _ := http.NewRequest("GET", url, nil)

	req.Header.Add("Authorization", "Bearer <token>")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(res)
	fmt.Println(string(body))

}
```

```ruby
require 'uri'
require 'net/http'

url = URI("https://app.polytomic.com/api/harbors/248df4b7-aa70-47b8-a036-33ac447e668d/contexts/248df4b7-aa70-47b8-a036-33ac447e668d/versions")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Get.new(url)
request["Authorization"] = 'Bearer <token>'

response = http.request(request)
puts response.read_body
```

```java
import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.Unirest;

HttpResponse<String> response = Unirest.get("https://app.polytomic.com/api/harbors/248df4b7-aa70-47b8-a036-33ac447e668d/contexts/248df4b7-aa70-47b8-a036-33ac447e668d/versions")
  .header("Authorization", "Bearer <token>")
  .asString();
```

```php
<?php
require_once('vendor/autoload.php');

$client = new \GuzzleHttp\Client();

$response = $client->request('GET', 'https://app.polytomic.com/api/harbors/248df4b7-aa70-47b8-a036-33ac447e668d/contexts/248df4b7-aa70-47b8-a036-33ac447e668d/versions', [
  'headers' => [
    'Authorization' => 'Bearer <token>',
  ],
]);

echo $response->getBody();
```

```csharp
using RestSharp;

var client = new RestClient("https://app.polytomic.com/api/harbors/248df4b7-aa70-47b8-a036-33ac447e668d/contexts/248df4b7-aa70-47b8-a036-33ac447e668d/versions");
var request = new RestRequest(Method.GET);
request.AddHeader("Authorization", "Bearer <token>");
IRestResponse response = client.Execute(request);
```

```swift
import Foundation

let headers = ["Authorization": "Bearer <token>"]

let request = NSMutableURLRequest(url: NSURL(string: "https://app.polytomic.com/api/harbors/248df4b7-aa70-47b8-a036-33ac447e668d/contexts/248df4b7-aa70-47b8-a036-33ac447e668d/versions")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "GET"
request.allHTTPHeaderFields = headers

let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
  if (error != nil) {
    print(error as Any)
  } else {
    let httpResponse = response as? HTTPURLResponse
    print(httpResponse)
  }
})

dataTask.resume()
```