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List:       twsocket
Subject:    [twsocket] Writing a transparent HTTP proxy
From:       "Fastream Technologies" <gates () fastream ! com>
Date:       2006-09-29 13:36:57
Message-ID: 9c4359460609290636l47193f73g7d05daa05200274b () mail ! gmail ! com
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Hello,

I have a few issues left for understanding how a transparent proxy works. I
talked with a friend in an ISP how they configure them and he said they use
Layer4 switches to redirect all HTTP port 80 traffic to the proxy even
though the end user does not configures his browser settings for the proxy.
Now with our reverse proxy experience, all is well except one thing: How
does the proxy know which IP to connect to when the end user uses HTTP/1.0
with no "host" header? Is transparent proxies HTTP/1.1 only? How does the
Layer4 switch understands what protocol does the end user uses if it can
read just up to layer 4 (TCP)?

Best Regards,

SZ
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