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Source View: http_headers_useragent

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Line Code
6326           if ( $wpdb->get_results( $wpdb->prepare("SELECT * FROM $wpdb->comments WHERE comment_post_ID = %d AND comment_author_url = %s", $post_ID, $pagelinkedfrom) ) )
6327                return $this->pingback_error( 48, __( 'The pingback has already been registered.' ) );
6328
6329           // very stupid, but gives time to the 'from' server to publish !
6330           sleep(1);
6331
6332           $remote_ip = preg_replace( '/[^0-9a-fA-F:., ]/', '', $_SERVER['REMOTE_ADDR'] );
6333
6334           /** This filter is documented in wp-includes/class-http.php */
6335           $user_agent = apply_filters( 'http_headers_useragent', 'WordPress/' . get_bloginfo( 'version' ) . '; ' . get_bloginfo( 'url' ) );
6336
6337           // Let's check the remote site
6338           $http_api_args = array(
6339                'timeout' => 10,
6340                'redirection' => 0,
6341                'limit_response_size' => 153600, // 150 KB
6342                'user-agent' => "$user_agent; verifying pingback from $remote_ip",
6343                'headers' => array(
6344                     'X-Pingback-Forwarded-For' => $remote_ip,