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EDIT :: https-detection.php

<?php /** * HTTPS detection functions. * * @package WordPress * @since 5.7.0 */ /** * Checks whether the website is using HTTPS. * * This is based on whether both the home and site URL are using HTTPS. * * @since 5.7.0 * @see wp_is_home_url_using_https() * @see wp_is_site_url_using_https() * * @return bool True if using HTTPS, false otherwise. */ function wp_is_using_https() { if ( ! wp_is_home_url_using_https() ) { return false; } return wp_is_site_url_using_https(); } /** * Checks whether the current site URL is using HTTPS. * * @since 5.7.0 * @see home_url() * * @return bool True if using HTTPS, false otherwise. */ function wp_is_home_url_using_https() { return 'https' === wp_parse_url( home_url(), PHP_URL_SCHEME ); } /** * Checks whether the current site's URL where WordPress is stored is using HTTPS. * * This checks the URL where WordPress application files (e.g. wp-blog-header.php or the wp-admin/ folder) * are accessible. * * @since 5.7.0 * @see site_url() * * @return bool True if using HTTPS, false otherwise. */ function wp_is_site_url_using_https() { /* * Use direct option access for 'siteurl' and manually run the 'site_url' * filter because `site_url()` will adjust the scheme based on what the * current request is using. */ /** This filter is documented in wp-includes/link-template.php */ $site_url = apply_filters( 'site_url', get_option( 'siteurl' ), '', null, null ); return 'https' === wp_parse_url( $site_url, PHP_URL_SCHEME ); } /** * Checks whether HTTPS is supported for the server and domain. * * This function makes an HTTP request through `wp_get_https_detection_errors()` * to check for HTTPS support. As this process can be resource-intensive, * it should be used cautiously, especially in performance-sensitive environments, * to avoid potential latency issues. * * @since 5.7.0 * * @return bool True if HTTPS is supported, false otherwise. */ function wp_is_https_supported() { $https_detection_errors = wp_get_https_detection_errors(); // If there are errors, HTTPS is not supported. return empty( $https_detection_errors ); } /** * Runs a remote HTTPS request to detect whether HTTPS supported, and stores potential errors. * * This function checks for HTTPS support by making an HTTP request. As this process can be resource-intensive, * it should be used cautiously, especially in performance-sensitive environments. * It is called when HTTPS support needs to be validated. * * @since 6.4.0 * @access private * * @return array An array containing potential detection errors related to HTTPS, or an empty array if no errors are found. */ function wp_get_https_detection_errors() { /** * Short-circuits the process of detecting errors related to HTTPS support. * * Returning a `WP_Error` from the filter will effectively short-circuit the default logic of trying a remote * request to the site over HTTPS, storing the errors array from the returned `WP_Error` instead. * * @since 6.4.0 * * @param null|WP_Error $pre Error object to short-circuit detection, * or null to continue with the default behavior. */ $support_errors = apply_filters( 'pre_wp_get_https_detection_errors', null ); if ( is_wp_error( $support_errors ) ) { return $support_errors->errors; } $support_errors = new WP_Error(); $response = wp_remote_request( home_url( '/', 'https' ), array( 'headers' => array( 'Cache-Control' => 'no-cache', ), 'sslverify' => true, ) ); if ( is_wp_error( $response ) ) { $unverified_response = wp_remote_request( home_url( '/', 'https' ), array( 'headers' => array( 'Cache-Control' => 'no-cache', ), 'sslverify' => false, ) ); if ( is_wp_error( $unverified_response ) ) { $support_errors->add( 'https_request_failed', __( 'HTTPS request failed.' ) ); } else { $support_errors->add( 'ssl_verification_failed', __( 'SSL verification failed.' ) ); } $response = $unverified_response; } if ( ! is_wp_error( $response ) ) { if ( 200 !== wp_remote_retrieve_response_code( $response ) ) { $support_errors->add( 'bad_response_code', wp_remote_retrieve_response_message( $response ) ); } elseif ( false === wp_is_local_html_output( wp_remote_retrieve_body( $response ) ) ) { $support_errors->add( 'bad_response_source', __( 'It looks like the response did not come from this site.' ) ); } } return $support_errors->errors; } /** * Checks whether a given HTML string is likely an output from this WordPress site. * * This function attempts to check for various common WordPress patterns whether they are included in the HTML string. * Since any of these actions may be disabled through third-party code, this function may also return null to indicate * that it was not possible to determine ownership. * * @since 5.7.0 * @access private * * @param string $html Full HTML output string, e.g. from a HTTP response. * @return bool|null True/false for whether HTML was generated by this site, null if unable to determine. */ function wp_is_local_html_output( $html ) { // 1. Check if HTML includes the site's Really Simple Discovery link. if ( has_action( 'wp_head', 'rsd_link' ) ) { $pattern = preg_replace( '#^https?:(?=//)#', '', esc_url( site_url( 'xmlrpc.php?rsd', 'rpc' ) ) ); // See rsd_link(). return str_contains( $html, $pattern ); } // 2. Check if HTML includes the site's REST API link. if ( has_action( 'wp_head', 'rest_output_link_wp_head' ) ) { // Try both HTTPS and HTTP since the URL depends on context. $pattern = preg_replace( '#^https?:(?=//)#', '', esc_url( get_rest_url() ) ); // See rest_output_link_wp_head(). return str_contains( $html, $pattern ); } // Otherwise the result cannot be determined. return null; }

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