Runs a remote HTTPS request to detect whether HTTPS supported, and stores potential errors.

This internal function is called by a regular Cron hook to ensure HTTPS support is detected and maintained.

function wp_update_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 5.7.0
	 *
	 * @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_update_https_detection_errors', null );
	if ( is_wp_error( $support_errors ) ) {
		update_option( 'https_detection_errors', $support_errors->errors );
		return;
	}

	$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.' ) );
		}
	}

	update_option( 'https_detection_errors', $support_errors->errors );
}