I have been using Standard Mode Web Proxy for some time, and thought it was working pretty well. Recently, I began adding Transparent Mode Web to catch the "crumbs" that bypass the standard proxy. I have been surprised by the amount of non-browser traffic that bypasses the proxy.
Some of the Transparent-mode traffic has been attributable to known fat-client applications, such as my AntiVirus, Skype, GoToMyPC, Adobe Auto-Update. Some is traceable to Microsoft stuff by the UserAgent string - Microsoft Office, Microsoft BITS, Microsoft Crypto API.
The biggest surprise is that Google Chrome seems to be allowing traffic to bypass the proxy. On a representative user, it was 25% of his total web traffic. Many of the URLs appear to be tracking and advertising sites, none appear to be operating system overhead.
I have not yet repeated the tests for an Internet Explorer user (if there are any left...)
Has anyone else seen similar results? Does anyone understand why I am seeing this result?
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