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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )
apply_filters( "hook_name", "what_to_filter" )
.Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
Line | Code |
---|---|
345 | $this->send_header( 'Access-Control-Allow-Headers', implode( ', ', $allow_headers ) ); |
346 |
|
347 | /** |
348 | * Send nocache headers on authenticated requests. |
349 | * |
350 | * @since 4.4.0 |
351 | * |
352 | * @param bool $rest_send_nocache_headers Whether to send no-cache headers. |
353 | */ |
354 | $send_no_cache_headers = apply_filters( 'rest_send_nocache_headers', is_user_logged_in() ); |
355 | if ( $send_no_cache_headers ) { |
356 | foreach ( wp_get_nocache_headers() as $header => $header_value ) { |
357 | if ( empty( $header_value ) ) { |
358 | $this->remove_header( $header ); |
359 | } else { |
360 | $this->send_header( $header, $header_value ); |
361 | } |
362 | } |
363 | } |