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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 |
|---|---|
| 246 | $expose_headers = array( 'X-WP-Total', 'X-WP-TotalPages', 'Link' ); |
| 247 | |
| 248 | /** |
| 249 | * Filters the list of response headers that are exposed to CORS requests. |
| 250 | * |
| 251 | * @since 5.5.0 |
| 252 | * |
| 253 | * @param string[] $expose_headers The list of headers to expose. |
| 254 | */ |
| 255 | $expose_headers = apply_filters( 'rest_exposed_cors_headers', $expose_headers ); |
| 256 | |
| 257 | $this->send_header( 'Access-Control-Expose-Headers', implode( ', ', $expose_headers ) ); |
| 258 | |
| 259 | $allow_headers = array( |
| 260 | 'Authorization', |
| 261 | 'X-WP-Nonce', |
| 262 | 'Content-Disposition', |
| 263 | 'Content-MD5', |
| 264 | 'Content-Type', |