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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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293 | } |
294 |
|
295 | /** |
296 | * Filters whether JSONP is enabled for the REST API. |
297 | * |
298 | * @since 4.4.0 |
299 | * |
300 | * @param bool $jsonp_enabled Whether JSONP is enabled. Default true. |
301 | */ |
302 | $jsonp_enabled = apply_filters( 'rest_jsonp_enabled', true ); |
303 |
|
304 | $jsonp_callback = false; |
305 | if ( isset( $_GET['_jsonp'] ) ) { |
306 | $jsonp_callback = $_GET['_jsonp']; |
307 | } |
308 |
|
309 | $content_type = ( $jsonp_callback && $jsonp_enabled ) ? 'application/javascript' : 'application/json'; |
310 | $this->send_header( 'Content-Type', $content_type . '; charset=' . get_option( 'blog_charset' ) ); |
311 | $this->send_header( 'X-Robots-Tag', 'noindex' ); |