透明代理的问题

没什么

我在rh9中用squid作代理，直接在浏览器中设置可用，但如在服务器上作透明代理的说就无法浏览网页了，不知道为什么？

出错信息：
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ERROR
The requested URL could not be retrieved

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While trying to retrieve the URL: /

The following error was encountered:

Invalid URL
Some aspect of the requested URL is incorrect. Possible problems:

Missing or incorrect access protocol (should be `http://'' or similar)
Missing hostname
Illegal double-escape in the URL-Path
Illegal character in hostname; underscores are not allowed
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