Fallback for uncached page

[Genaker]

server {
listen 80 default_server;

location / {
    
    if ($uri ~ "^/$") {
        rewrite / /404;
    }
    
    proxy_intercept_errors on;
    proxy_pass http://codes:80;
    
    error_page 403 404 503 = @outage;
    
    error_page 400 401 500 = @miss-php;
}

location @outage {
    rewrite ^ /200;
    proxy_pass http://codes:80;
}

location @miss-php {
    fastcgi_pass codes-php:9000;
    include fastcgi_params;
    fastcgi_param SCRIPT_FILENAME /var/www/html/index.php;
    fastcgi_param DOCUMENT_ROOT /var/www/html;
    internal;
}

}