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HTTPS or Subversion.
There are some searchengines that don't have the keywords as part of the querystring. Keywords are included in the path instead.
Piwik should be able to identify those keywords, aswell.
Those are all powered by Infospace's "metasearch" engine.
Their other sites include:
(In ) fixes #1690 - adds support for regular expressions
note: search.kiwee.com is handled as a case of InfoSpace powered metasearch
(In ) refs #1690 - cleanup dogpile
(In ) refs #1564 added missing 123people.it, fixed 123people's keyword recognition (using regex now)
refs #1690 do not abort keyword recognition if no query string is given
(In ) refs #1690 removed ws.copernic.com as it is infospace powered, added test
(In ) refs #1690 fixed msxml.excite.com (using regex recognition)