This is a really good explanation of this: http://answers.google.com/answers/threadview/id/758002.html#answer
Summary: only the host and port would be visible unencrypted.
In short, yes. But you shouldn't store sensitive data in URL's since it may be visible in the browsers history and server logfiles. And anyone who looks over your shoulder sees it too.
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…