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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 |
|---|---|
| 239 | $this->send_header( 'Access-Control-Allow-Headers', 'Authorization, Content-Type' ); |
| 240 | |
| 241 | /** |
| 242 | * Send nocache headers on authenticated requests. |
| 243 | * |
| 244 | * @since 4.4.0 |
| 245 | * |
| 246 | * @param bool $rest_send_nocache_headers Whether to send no-cache headers. |
| 247 | */ |
| 248 | $send_no_cache_headers = apply_filters( 'rest_send_nocache_headers', is_user_logged_in() ); |
| 249 | if ( $send_no_cache_headers ) { |
| 250 | foreach ( wp_get_nocache_headers() as $header => $header_value ) { |
| 251 | if ( empty( $header_value ) ) { |
| 252 | $this->remove_header( $header ); |
| 253 | } else { |
| 254 | $this->send_header( $header, $header_value ); |
| 255 | } |
| 256 | } |
| 257 | } |