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nocache_headers()

nocache_headers()

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Sets the HTTP headers to prevent caching for the different browsers.

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

More Information

Usage:
nocache_headers();

Source

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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UsesDescription
wp_get_nocache_headers()wp-includes/functions.php

Gets the HTTP header information to prevent caching.

Used byDescription
_jsonp_wp_die_handler()wp-includes/functions.php

Kills WordPress execution and displays JSONP response with an error message.

_xml_wp_die_handler()wp-includes/functions.php

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

_json_wp_die_handler()wp-includes/functions.php

Kills WordPress execution and displays JSON response with an error message.

WP_Customize_Manager::customize_preview_init()wp-includes/class-wp-customize-manager.php

Prints JavaScript settings.

auth_redirect()wp-includes/pluggable.php

Checks if a user is logged in, if not it redirects them to the login page.

WP::handle_404()wp-includes/class-wp.php

Set the Headers for 404, if nothing is found for requested URL.

wp_not_installed()wp-includes/load.php

Redirects to the installer if WordPress is not installed.

_default_wp_die_handler()wp-includes/functions.php

Kills WordPress execution and displays HTML page with an error message.

_ajax_wp_die_handler()wp-includes/functions.php

Kills WordPress execution and displays Ajax response with an error message.

_xmlrpc_wp_die_handler()wp-includes/functions.php

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

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Changelog

VersionDescription
2.0.0Introduced.

User Contributed Notes

  1. Skip to note 2 content
    iSaumya
    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

    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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