a60814billy/index.html

## index.html
<!-- /var/www/main-site/index.html -->
<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="UTF-8" />
		<title>Main Product Site</title>
		<body>
			<h1>Hello !</h1>
	    <script>
    		document.write(location.search);
    	</script>
		</body>
</html>

## main.conf
# /etc/nginx/sites-available/main.conf
server {
    server_name www.product.com;
    location / {
        root /var/www/main-site;
    }
}

## reseller.conf
# /etc/nginx/sites-available/reseller.conf
include reseller_map.conf;

server {
    server_name md.example.com user1.example.com;

    rewrite ^(.*)$ http://www.product.com$1?proxy=$seller_id last;
    return 302;

}

server {
    server_name apple.example.com;
    server_name orange.example.com;
    rewrite ^(.*)$ http://www.product.com$1?proxy=$seller_id last;
    return 302;
}

## reseller_map.conf
# /etc/nginx/reseller_map.conf
map $http_host $seller_id {
    hostnames;
    default             "0";
    md.example.com      "md001";
    user1.example.com   "user";
    apple.example.com   "apple-pen";
    orange.example.com  "org";
}
	<!-- /var/www/main-site/index.html -->
	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="UTF-8" />
	<title>Main Product Site</title>
	<body>
	<h1>Hello !</h1>
	<script>
	document.write(location.search);
	</script>
	</body>
	</html>
	# /etc/nginx/sites-available/main.conf
	server {
	server_name www.product.com;
	location / {
	root /var/www/main-site;
	}
	}
	# /etc/nginx/sites-available/reseller.conf
	include reseller_map.conf;

	server {
	server_name md.example.com user1.example.com;

	rewrite ^(.*)$ http://www.product.com$1?proxy=$seller_id last;
	return 302;

	}

	server {
	server_name apple.example.com;
	server_name orange.example.com;
	rewrite ^(.*)$ http://www.product.com$1?proxy=$seller_id last;
	return 302;
	}
	# /etc/nginx/reseller_map.conf
	map $http_host $seller_id {
	hostnames;
	default "0";
	md.example.com "md001";
	user1.example.com "user";
	apple.example.com "apple-pen";
	orange.example.com "org";
	}