how to get the root of a web application with watir/firewati

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Hi,
Somebody knows how to get the root of the web application.
For example if I am in: www.elmundo.es/ppe/sskk/aaa.htm the root maybe
can be www.elmundo.es/ppe/ or maybe is www.elmundo.es/

I'm using watir / firewatir.

Thank you in advance.
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