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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 |
|---|---|
| 431 | * Content-* headers needed to upload files to the media endpoints. |
| 432 | * As well as the Authorization and Nonce headers for allowing authentication. |
| 433 | * |
| 434 | * @since 5.5.0 |
| 435 | * @since 6.3.0 The `$request` parameter was added. |
| 436 | * |
| 437 | * @param string[] $allow_headers The list of request headers to allow. |
| 438 | * @param WP_REST_Request $request The request in context. |
| 439 | */ |
| 440 | $allow_headers = apply_filters( 'rest_allowed_cors_headers', $allow_headers, $request ); |
| 441 | |
| 442 | $this->send_header( 'Access-Control-Allow-Headers', implode( ', ', $allow_headers ) ); |
| 443 | |
| 444 | $result = $this->check_authentication(); |
| 445 | |
| 446 | if ( ! is_wp_error( $result ) ) { |
| 447 | $result = $this->dispatch( $request ); |
| 448 | } |
| 449 | |