Configure Wordpress use SSL behind reverse proxy (Nginx)

wordpress-behind-nginx.txt

- Topology: Client ==> Reverse proxy (Nginx is listened at port 443) ======> Backend (Apache is listened at port 80).

- Nginx configure
proxy_set_header X-Forwarded-Host $host;
proxy_set_header X-Forwarded-Server $host;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

- Wordpress configure:
cat wp-config.php
.....
/**
 * Make PHP HTTPS aware via HTTP_X_FORWARDED_PROTO
 */
if(isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && $_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https') {
    $_SERVER['HTTPS']='on';
}

/** Sets up WordPress vars and included files. */
define('FS_METHOD', 'direct');
require_once(ABSPATH . 'wp-settings.php');