I want that “subdomain.domain.com” masks and points to an external url like “http://xxx.yyy.com/12345/”.
Can you give me a step by step procedure? My droplet is Ubuntu WordPress on 14.04.
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You could use something such as:
RedirectPermanent / http://xxx.yyy.com/12345/
and then restart Apache for the changes to take.
You create a vhost in your webserver configuration that redirects or proxies to your desired URL.