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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 |
|---|---|
| 1225 | // If the caller expects signature verification to occur, check to see if this URL supports it. |
| 1226 | if ( $signature_verification ) { |
| 1227 | /** |
| 1228 | * Filters the list of hosts which should have Signature Verification attempted on. |
| 1229 | * |
| 1230 | * @since 5.2.0 |
| 1231 | * |
| 1232 | * @param string[] $hostnames List of hostnames. |
| 1233 | */ |
| 1234 | $signed_hostnames = apply_filters( 'wp_signature_hosts', array( 'wordpress.org', 'downloads.wordpress.org', 's.w.org' ) ); |
| 1235 | |
| 1236 | $signature_verification = in_array( parse_url( $url, PHP_URL_HOST ), $signed_hostnames, true ); |
| 1237 | } |
| 1238 | |
| 1239 | // Perform signature valiation if supported. |
| 1240 | if ( $signature_verification ) { |
| 1241 | $signature = wp_remote_retrieve_header( $response, 'x-content-signature' ); |
| 1242 | |
| 1243 | if ( ! $signature ) { |