proxy-aware-https-fix/proxy-aware-https-fix.php at main · bitcryptic-gw/proxy-aware-https-fix · GitHub

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<?php

/**
 * Plugin Name: Proxy-Aware HTTPS Fix
 * Description: Enforces HTTPS detection and correct REST API resolution behind reverse proxies.
 * Version: 1.3
 * Author: BitCryptic
 */

if ( defined( 'WP_CLI' ) && WP_CLI ) {
	return;
}

add_action(
	'plugins_loaded',
	function () {
		$host  = $_SERVER['HTTP_HOST'] ?? '';
		$proto = $_SERVER['HTTP_X_FORWARDED_PROTO'] ?? '';

		if (
		( ! isset( $_SERVER['HTTPS'] ) || $_SERVER['HTTPS'] !== 'on' ) &&
		( $proto === 'https' || strpos( $host, '.' ) !== false )
		) {
			$_SERVER['HTTPS'] = 'on';
		}
	}
);

add_filter(
	'home_url',
	function ( $url ) {
		return str_starts_with( $url, 'http:' ) ? 'https:' . substr( $url, 5 ) : $url;
	}
);

add_filter(
	'site_url',
	function ( $url ) {
		return str_starts_with( $url, 'http:' ) ? 'https:' . substr( $url, 5 ) : $url;
	}
);

add_filter(
	'rank_math/rest_api_url',
	function () {
		return get_site_url( null, '/wp-json/' );
	}
);