Title: send_nosniff_header
Published: April 25, 2014
Last modified: May 20, 2026

---

# send_nosniff_header()

## In this article

 * [Description](https://developer.wordpress.org/reference/functions/send_nosniff_header/?output_format=md#description)
    - [See also](https://developer.wordpress.org/reference/functions/send_nosniff_header/?output_format=md#see-also)
 * [Source](https://developer.wordpress.org/reference/functions/send_nosniff_header/?output_format=md#source)
 * [Changelog](https://developer.wordpress.org/reference/functions/send_nosniff_header/?output_format=md#changelog)

[ Back to top](https://developer.wordpress.org/reference/functions/send_nosniff_header/?output_format=md#wp--skip-link--target)

Sends a HTTP header to disable content type sniffing in browsers which support it.

## 󠀁[Description](https://developer.wordpress.org/reference/functions/send_nosniff_header/?output_format=md#description)󠁿

### 󠀁[See also](https://developer.wordpress.org/reference/functions/send_nosniff_header/?output_format=md#see-also)󠁿

 * [https://blogs.msdn.com/ie/archive/2008/07/02/ie8-security-part-v-comprehensive-protection.aspx](https://blogs.msdn.com/ie/archive/2008/07/02/ie8-security-part-v-comprehensive-protection.aspx/)
 * [https://src.chromium.org/viewvc/chrome?view=rev&revision=6985](https://src.chromium.org/viewvc/chrome?view=rev&revision=6985/)

## 󠀁[Source](https://developer.wordpress.org/reference/functions/send_nosniff_header/?output_format=md#source)󠁿

    ```php
    function send_nosniff_header() {
    	header( 'X-Content-Type-Options: nosniff' );
    }
    ```

[View all references](https://developer.wordpress.org/reference/files/wp-includes/functions.php/)
[View on Trac](https://core.trac.wordpress.org/browser/tags/7.0/src/wp-includes/functions.php#L7078)
[View on GitHub](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/functions.php#L7078-L7080)

## 󠀁[Changelog](https://developer.wordpress.org/reference/functions/send_nosniff_header/?output_format=md#changelog)󠁿

| Version | Description | 
| [3.0.0](https://developer.wordpress.org/reference/since/3.0.0/) | Introduced. |

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