Via header echoed in reply

What steps will reproduce the problem?
1. Install Polipo 1.0.1 with the disableVia=false option
2. Configure Web browser to use Polipo as HTTP proxy
3. Enter http://wiki.tcl.tk/ in the address bar

What is the expected output? What do you see instead?
I should see the Tcl wiki, but instead I get "The proxy on (host:port)
encountered the following error while fetching http://wiki.tcl.tk/:
504 Proxy loop detected".

I emailed the author of Polipo about this issue, and he responded with more
information about it:

> Accessing any page in the Tcl Wiki (http://wiki.tcl.tk/) results in an
> erroneous 504 when using Polipo 0.9.9.  Upgrading to 1.0.1 fixes the
> problem.

No, it doesn't, it just works around it.  You can still reproduce the
issue with 1.0.1 if you set

 disableVia: false

in Polipo's config file.

The Wiki code is broken.  For some strange reason, it is echoing the
client's Via header in the reply.  This breaks Polipo.

                                       Juliusz

Original issue reported on code.google.com by andrew.m.goth@gmail.com on 4 Jul 2007 at 1:36

jdc8 / wub

Via header echoed in reply #1