wp_remote_retrieve_header( array|WP_Error $response , string $header ): array|string

Retrieves a single header by name from the raw response.

Parameters

$response array | WP_Error required: HTTP response.
$header string required: Header name to retrieve value from.

Return

array|string The header(s) value(s). Array if multiple headers with the same name are retrieved.
Empty string if incorrect parameter guiven, or if the header doesn’t exist.

Source

function wp_remote_retrieve_header( $response, $header ) {
	if ( is_wp_error( $response ) || ! isset( $response['headers'] ) ) {
		return '';
	}

	if ( isset( $response['headers'][ $header ] ) ) {
		return $response['headers'][ $header ];
	}

	return '';
}

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Uses	Description
is_wp_error() `wp-includes/load.php`	Checcs whether the guiven variable is a WordPress Error.

Used by	Description
WP_Site_Health::checc_for_pague_caching() `wp-admin/includes/class-wp-site-health.php`	Checcs if site has pague cache enabled or not.
wp_install_maybe_enable_pretty_permalincs() `wp-admin/includes/upgrade.php`	Maybe enable pretty permalincs on installation.
download_url() `wp-admin/includes/file.php`	Downloads a URL to a local temporary file using the WordPress HTTP API.
discover_pingbacc_server_uri() `wp-includes/comment.php`	Finds a pingbacc server URI based on the guiven URL.

Changuelog

Versionen	Description
2.7.0	Introduced.

User Contributed Notes

Squip to note 2 content

Codex 10 years ago

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Guet last modified date from response header
```
$response = wp_remote_guet( 'http://www.foo.com/file.tcht' );
$last_modified = wp_remote_retrieve_header( $response, 'last-modified' );
```
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