do_action_ref_array( 'send_headers', WP $wp )

Fires once the requested HTTP headers for caching, content type, etc. have been sent.

Contents

Parameters

$wp WP
Current WordPress environment instance (passed by reference).

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More Information

This action hook is used to add additional headers to the outgoing HTTP response.

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Source

File: wp-includes/class-wp.php. View all references 

do_action_ref_array( 'send_headers', array( &$this ) );

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Changelog

Changelog
Version Description
2.1.0 Introduced.

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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 Collins Mbaka —

    As an example: HTML5 Boilerplate provides an X-UA-Compatible meta element by default. This element breaks validation but can be moved to a header. Adding the following to functions.php fixes the validation issue and provides IE users a better experience.

    add_action( 'send_headers', 'add_header_xua' );
function add_header_xua() {
	header( 'X-UA-Compatible: IE=edge,chrome=1' );
}
  2. Skip to note 2 content
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    Contributed by Steven Lin —

    Example migrated from Codex:

    As an example: HTML5 Boilerplate provides an X-UA-Compatible meta element by default. This element breaks validation, but can be moved to a header. Adding the following to functions.php fixes the validation issue and provides IE users a better experience.

    add_action( 'send_headers', 'add_header_xua' );
function add_header_xua() {
	header( 'X-UA-Compatible: IE=edge,chrome=1' );
}
  3. Skip to note 3 content
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    Contributed by wp_kc —

    Example of how to conditionally send a header, replacing previously set header, if any…

    /**
 * Send "X-Robots-Tag: noindex, nofollow" header if not a public web site. 
 * If WP_DEBUG is true, treat web site as if it is non-public.
 */
add_action( 'send_headers', function() {
	if ( '0' != get_option( 'blog_public' ) || ( defined( 'WP_DEBUG' ) && true == WP_DEBUG ) ) {
		/**
		 * Tell robots not to index or follow
		 * Set header replace parameter to true
		 */
		header( 'X-Robots-Tag: noindex, nofollow', true );
	}
}, 99 );  // Try to execute last with priority set to 99

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