nocache_headers()

Set the headers to prevent caching for the different browsers.

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Description Description

Different browsers support different nocache headers, so several headers must be sent so that all of them get the point that no caching should occur.

See also See also

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More Information More Information

Usage:
nocache_headers();

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Source Source

File: wp-includes/functions.php 

function nocache_headers() {
	if ( headers_sent() ) {
		return;
	}

	$headers = wp_get_nocache_headers();

	unset( $headers['Last-Modified'] );

	header_remove( 'Last-Modified' );

	foreach ( $headers as $name => $field_value ) {
		header( "{$name}: {$field_value}" );
	}
}

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Used By Used By

Used By
Used By Description
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Checks if a user is logged in, if not it redirects them to the login page.
wp-includes/class-wp.php: WP::handle_404()

Set the Headers for 404, if nothing is found for requested URL.
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Redirect to the installer if WordPress is not installed.
wp-includes/functions.php: _default_wp_die_handler()

Kills WordPress execution and displays HTML page with an error message.
wp-includes/functions.php: _ajax_wp_die_handler()

Kills WordPress execution and displays Ajax response with an error message.
wp-includes/functions.php: _xmlrpc_wp_die_handler()

Kills WordPress execution and displays XML response with an error message.
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Changelog Changelog

Changelog
Version Description
2.0.0 Introduced.

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User Contributed Notes User Contributed Notes

  1. Skip to note 1 content
    You must log in to vote on the helpfulness of this noteVote results for this note: 0You must log in to vote on the helpfulness of this note
    Contributed by Saumya Majumder —

    Use nocache_headers to add custom headers to wp-admin pages. Example code:

    add_filter( 'nocache_headers', function() {
    return array(
        'Cache-Control' => 'no-store, no-cache, must-revalidate, max-age=0, some-custom-thing',
        'Pragma'        => 'no-cache',
        'Expires'       => gmdate( 'D, d M Y H:i:s \G\M\T', time() )
    );
} );

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