Re: Firefox using google proxy WTF?

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Christoph Höger writes:

Hi,

I am using an of the shelf firefox rpm. Today the strangest thing
happened to me: I got an google branded 404 when searching wikipedia.
The site is definitely up and running and my network settings must be
fine, since Konqueror and wget get the site (see attached screenshot).

Obviously I only noted it, because googles proxy must have been down or
something.

So since when does google proxy my http traffic? And who allowed this
behavior in a fedora rpm?

Looks very familiar. Are you using privoxy? I was getting the same weird clusterfscks until I figured it out.

Edit /etc/privoxy/config and comment out the keep-alive-timeout setting. The default Fedora rpm package installs a non-default keep-alive-timeout setting.

Looks like there's a disagreement between Firefox and privoxy regarding how HTTP/1.1 persistent connections should work in a proy setting. Privoxy seems to believe that if the client wants to proxy to a different host, when using keep-alives, that the client should use a different proxy connection. Privoxy assumes that, with keep-alive, the client would only send requests to the same server, through the persistent connection.

Firefox, though, apparently believes that it is entitled to use an existing persistent connection to an HTTP proxy to send an HTTP request to a different host.

Ergo, privoxy ends up forwarding an HTTP request to the wrong host.

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