Title: WP_HTTP_Requests_Response::header
Published: August 16, 2016
Last modified: April 28, 2025

---

# WP_HTTP_Requests_Response::header( string $key, string $value, bool $replace = true )

## In this article

 * [Parameters](https://developer.wordpress.org/reference/classes/wp_http_requests_response/header/?output_format=md#parameters)
 * [Source](https://developer.wordpress.org/reference/classes/wp_http_requests_response/header/?output_format=md#source)
 * [Changelog](https://developer.wordpress.org/reference/classes/wp_http_requests_response/header/?output_format=md#changelog)

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

Sets a single HTTP header.

## 󠀁[Parameters](https://developer.wordpress.org/reference/classes/wp_http_requests_response/header/?output_format=md#parameters)󠁿

 `$key`stringrequired

Header name.

`$value`stringrequired

Header value.

`$replace`booloptional

Whether to replace an existing header of the same name.

Default:`true`

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

    ```php
    public function header( $key, $value, $replace = true ) {
    	if ( $replace ) {
    		unset( $this->response->headers[ $key ] );
    	}

    	$this->response->headers[ $key ] = $value;
    }
    ```

[View all references](https://developer.wordpress.org/reference/files/wp-includes/class-wp-http-requests-response.php/)
[View on Trac](https://core.trac.wordpress.org/browser/tags/6.9.4/src/wp-includes/class-wp-http-requests-response.php#L101)
[View on GitHub](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/class-wp-http-requests-response.php#L101-L107)

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

| Version | Description | 
| [4.6.0](https://developer.wordpress.org/reference/since/4.6.0/) | Introduced. |

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