This is not limited to the wiki page and is part of the GFM (GitHub Flavored Markdown) URL autodetection function a>.
Including them in `` may work, but displays the URL as a code: foo http://example.com .
foo `http://example.com` bar
Another trick ( mentioned in this meaning )
ht<span>tp://</span>example.com
This will display http://example.com as plain text.
In your case (without http: //)
w<span>ww.</span>foobar.com
It would also display www.foobar.com as plain text.
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