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List:       privoxy-users
Subject:    Re: [privoxy-users] Variables from the URL
From:       Fabian Keil <fk () fabiankeil ! de>
Date:       2008-05-01 15:46:00
Message-ID: 20080501174600.0e44046e () fabiankeil ! de
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"drpr0ctologist@gmail.com" <drpr0ctologist@gmail.com> wrote:

> Is it possible to store and get parts of the URL as a variable? For instance
> I want to take part of the URL and use it as part of the header passed back.
> 
> So for instance, if I go to the URL http://www.example.org, I'd like to pass
> the header "spam@example.org" using the "+hide-from-header" configuration
> directive.

I don't think that's a good idea. Anyway ...

The hide-from-header action doesn't support variables,
however dynamic filters support a few fixed variables.

Quoting default.filter:

# Note2: In addition to the Perl options gimsx, the following nonstandard
# options are supported:
[...]
# 'D' (Dynamic) allows the use of variables. Supported variables are:
#     $host, $origin (the IP address the request came from), $path and $url.
#
#     Note that '$' is a bad choice as delimiter for dynamic filters as you
#     might end up with unintended variables if you use a variable name
#     directly after the delimiter. Variables will be resolved without
#     escaping anything, therefore you also have to be careful not to chose
#     delimiters that appear in the replacement text. For example '<' should
#     be save, while '?' will sooner or later cause conflicts with $url.

You should be able to do what you want with a custom client-header
filter that first includes $url and later on removes parts of it again.

Fabian

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