Re: Switch forward rules on-the-fly?

Fabian Keil <[email protected]> Wed, 10 Oct 2018 15:55:42 +0200
Newsgroups	gmane.comp.web.privoxy.user
Message-ID	<[email protected]>
Az <[email protected]> wrote:

> On Sunday 7 October 2018 08:49,
> Az <[email protected]> put forth the proposition:
> > On Sunday 7 October 2018 07:59,
> > Az <[email protected]> put forth the proposition:  
> > > On Sunday 7 October 2018 06:25,
> > > Az <[email protected]> put forth the proposition:  

> > > > I use a text browser with Tor quite a lot and often come up against
> > > > captchas. When this happens I usually go through a different proxy,
> > > > but then I lose the privoxy protection. It's either that or boot X11
> > > > and a GUI browser, find the site again and complete the captcha.
> > > >
> > > > Is there a way of switching from one proxy to another somehow via my
> > > > browser that doesn't involve turning off privoxy or adding a rule for
> > > > each site that this happens with? With my regular sites I do add
> > > > rules to go direct or via a plain http proxy, but I don't want to do
> > > > it for every random site that uses cloudflare etc., which seem to be
> > > > on the increase now.
> > > >
> > > > I'm kind of thinking something I could add to the URL to let privoxy
> > > > know that I need to use a different forward rule. I looked at tags,
> > > > but I'm not sure I really understand if they could work for what I
> > > > want.  
> > >
> > > Well I almost had something working. I added /1234567890 on to the
> > > end of a URL and set up a simple redirect like s@/1234567890$@@. It
> > > worked OK for http, but of course not for https.
> > >
> > > Then I tried adding a subdomain 'forward-socks5.' to the start, but
> > > it fails with this error:
> > >
> > > Error: pcrs command "s@forward-socks5.@@" changed
> > > "forward-socks5.duckduckgo.com:443" to "duckduckgo.com:443" (1 hit), but the
> > > result doesn't look like a valid URL and will be ignored.
> > >
> > > Why is this URL seen as an error?
> > >
> > > The actual URL I entered in the browser was
> > >
> > > https://forward-socks5.duckduckgo.com/lite/  
> >
> > Sorry to keep answering my own questions :)
> >
> > I found add the https:// seems to work so far.  
> 
> OK. Redirect obviously isn't going to work, because the browser will
> get passed to Tor again after the redirect. What I need is to
> *rewrite* the URL without the browser knowing.
> 
> So far the only thing I can see that may work is to add a TAG: on the
> user agent, and have a script to change the user agent in my browser.
> The problem is making sure that it gets changed back, or that the
> rule has a timer. Adding weird user agents isn't a great idea though.
> 
> Dunno. Maybe there's a better way.

A better way is to use a client-specific tag that sets the
forward-override action:
https://www.privoxy.org/user-manual/config.html#CLIENT-SPECIFIC-TAG
https://www.privoxy.org/user-manual/actions-file.html#FORWARD-OVERRIDE

While this will affect all requests (from the IP address)
you can set a small timeout that is sufficient to load
the capture-using website.

Fabian

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