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# Close A Backend Data Stream

POST https://localhost:5000/v1/api/iserver/marketdata/unsubscribe
Content-Type: application/json

Instruct IServer to close its backend stream for the instrument when real-time snapshots are no longer needed.

Reference: https://ibkrcampus.com/docs/web-api/api-reference/trading/trading-market-data/close-md-stream

## Authentication

- `Authorization` header (bearer token, required) — SSO bearer token.

## Servers

- `https://localhost:5000` (Client Portal Gateway, default)
- `https://api.ibkr.com` (Production)
- `https://qa.interactivebrokers.com` (Sandbox)

## Request

### Body (application/json)

This endpoint expects an object.

- `conid` (long, optional) — The IB contract ID of the instrument whose market data feed is to be unsubscribed.

## Response

### 200

Acknowledges a successful request

- `success` (boolean, optional) — The sole key 'success' will have boolean value true.

## Errors

### 400 Bad Request Error

Missing, empty, non-numeric, or out-of-range parameter. The `error` field is always prefixed with `Bad Request:`.

- `status` (long, optional)
- `error` (string, optional)
- `message` (string, optional)

### 401 Unauthorized Error

Missing, invalid, or unparseable Authorization token.

- `status` (long, optional)
- `error` (string, optional)
- `message` (string, optional)

### 500 Internal Server Error

internal server error, returned when incoming request cannot be processed. It can sometimes include subset of bad requests. For example, wrong accountId passed and it can only be detected later in handling request. Error contains reason of the problem.

- `error` (string, optional) — error reason

### 503 Service Unavailable Error

service is unavailable. For example if request takes more than 10s due to some internal service unavailability, request aborted and this status returned

- `error` (string, optional) — error reason
- `statusCode` (long, optional) — mimic response status code

## Examples

**Request**

```json
{}
```

**Response**

```json
{
  "success": true
}
```

**SDK Code**

```python marketdataUnsubscribeSuccessExample
import requests

url = "https://localhost:5000/v1/api/iserver/marketdata/unsubscribe"

payload = {}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.json())
```

```javascript marketdataUnsubscribeSuccessExample
const url = 'https://localhost:5000/v1/api/iserver/marketdata/unsubscribe';
const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: '{}'
};

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

```go marketdataUnsubscribeSuccessExample
package main

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

func main() {

	url := "https://localhost:5000/v1/api/iserver/marketdata/unsubscribe"

	payload := strings.NewReader("{}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

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

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

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

}
```

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

url = URI("https://localhost:5000/v1/api/iserver/marketdata/unsubscribe")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{}"

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

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

HttpResponse<String> response = Unirest.post("https://localhost:5000/v1/api/iserver/marketdata/unsubscribe")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{}")
  .asString();
```

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

$client = new \GuzzleHttp\Client();

$response = $client->request('POST', 'https://localhost:5000/v1/api/iserver/marketdata/unsubscribe', [
  'body' => '{}',
  'headers' => [
    'Authorization' => 'Bearer <token>',
    'Content-Type' => 'application/json',
  ],
]);

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

```csharp marketdataUnsubscribeSuccessExample
using RestSharp;

var client = new RestClient("https://localhost:5000/v1/api/iserver/marketdata/unsubscribe");
var request = new RestRequest(Method.POST);
request.AddHeader("Authorization", "Bearer <token>");
request.AddHeader("Content-Type", "application/json");
request.AddParameter("application/json", "{}", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
```

```swift marketdataUnsubscribeSuccessExample
import Foundation

let headers = [
  "Authorization": "Bearer <token>",
  "Content-Type": "application/json"
]
let parameters = [] as [String : Any]

let postData = JSONSerialization.data(withJSONObject: parameters, options: [])

let request = NSMutableURLRequest(url: NSURL(string: "https://localhost:5000/v1/api/iserver/marketdata/unsubscribe")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "POST"
request.allHTTPHeaderFields = headers
request.httpBody = postData as Data

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()
```