/etc/hosts (or DNS) does not come into play at all. Again, see RFC 2616 for how a webserver can determine which host ("website") was meant by the client.

As the original post mentions in the title "virtual host", I would assume that the web server already is configured to serve multiple websites under the same IP address (and port).

In reply to Re^5: Get data via HTTP on IP and specify virtual host by Corion
in thread Get data via HTTP on IP and specify virtual host by j99

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