> **Documentation Index:** Fetch the complete configuration index at https://yandex.com/support2/site/en/llms.txt

# Update the site list using an HTTP request

The list of search topic sites can be updated programmatically using a special POST request. When Yandex Site Search receives such a POST request, it automatically sends the updated topic for moderation.


## Authorization {#concept1}

To update the topic sites using POST requests, you must specify the IP address or subnet of the servers from which the requests will be sent in the topic properties. For example, 93.158.156.27/64.

You also need to enter the topic key. You can find it on your [search topics page](http://site.yandex.ru/themes/?lang=en). Note: when the IP address changes, a new key is generated.


## Request formation {#concept2}

To update the list of topic sites, send a POST request to `http://site.yandex.ru/update_urls.xml`. The request must contain a `Content-Type` header:

```
Content-Type: application/x-www-form-urlencoded
```

The request must also specify the following parameters:

```
key=<topic key>&id=<login>&category_id=<topic id>&urls=<urlencoded site list>
```

For example, if the key is `b11f3e1d35a1a01cb009a19dcf8f259b4bcaaf33`, the login is `some_login`, the topic id is `43210123`, and the list of sites is:

```
some-site-000.com
some-site-001.com
some-site-002.com
some-site-003.com
```

The request should look like this:

```
POST /update_urls.xml HTTP/1.1
Content-type: application/x-www-form-urlencoded
Host: site.yandex.ru
Content-Length: 174

key=b11f3e1d35a1a01cb009a19dcf8f259b4bcaaf33&id=some_login&category_id=43210123&
urls=some-site-000.com%0Asome-site-001.com%0Asome-site-002.com%0Asome-site-003.com
```


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