do_action_ref_array( 'send_headers', WP $this )
Fires once the requested HTTP headers for caching, content type, etc. have been sent.
Parameters Parameters
- $this
-
(WP) Current WordPress environment instance (passed by reference).
More Information More Information
This action hook is used to add additional headers to the outgoing HTTP response.
Source Source
File: wp-includes/class-wp.php
Changelog Changelog
| Version | Description |
|---|---|
| 2.1.0 | Introduced. |
User Contributed Notes User Contributed Notes
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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' ); }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' ); }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