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JIA Java Italian Association

Have you considered checking the documentation for HttpServletRequest?
It's unbelievable how much interesting stuff you can find. Something like this:

public java.lang.StringBuffer getRequestUrl()

Reconstructs the URL the client used to make the request. The returned URL contains a protocol, server name, port number, and server path, but it does not include query string parameters [...].

If you want to extract only the domain name (www.jguru.com) from the url, use getServerName().