How can you set Safari to warn you each time you access an insecure wireless connection?

The first time you access an insecure internet connection, Safari warns you, but I can’t figure out how to set up a warning for subsequent time. I travel to Chicago pretty often, and there are a networks that I use with my iPad (sometimes at Starbucks, I hang my head and admit).

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Story added 13. June 2012, content source with full text you can find at link above.