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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 |
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243 | $this->send_header( 'Access-Control-Allow-Headers', 'Authorization, Content-Type' ); |
244 |
|
245 | /** |
246 | * Send nocache headers on authenticated requests. |
247 | * |
248 | * @since 4.4.0 |
249 | * |
250 | * @param bool $rest_send_nocache_headers Whether to send no-cache headers. |
251 | */ |
252 | $send_no_cache_headers = apply_filters( 'rest_send_nocache_headers', is_user_logged_in() ); |
253 | if ( $send_no_cache_headers ) { |
254 | foreach ( wp_get_nocache_headers() as $header => $header_value ) { |
255 | $this->send_header( $header, $header_value ); |
256 | } |
257 | } |
258 |
|
259 | /** |
260 | * Filters whether the REST API is enabled. |
261 | * |