On Thu, Jun 06, 2002 at 05:41:27PM +0530, Philip S Tellis wrote:
> Is that possible logically?  When you say transparent proxy, you mean 
> that the user has no knowledge of its existence.  If it goes about 
> advertising its presence by way of a huge authentication dialog box, how 
> transparent is that going to be?

The problem will come much before that.

In normal proxy, the browser is supposed to send a request like:

GET http://slashdot.org HTTP/1.1
Host: slashdot.org
... [remaining headers]

and the proxy will respond with the page, or 407 Authorization Required
or whatever...

In a transparent proxy, the browser will send a request:

GET / HTTP/1.1
Host: slashdot.org
... [remainder]

and the proxy will get it from wherever it is supposed to.

If you send the second request to a proxy of the first type, you get
a 400 Bad Request (from squid, at least) - since it is expecting a
full URI as the GET request.

So, the browser should know if it is dealing with a proxy, to format
the request accordingly. It talks to a transparent proxy the same way
it would to a normal web server.

Binand


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