[Privoxy-users] forward-override based on user-agent tag does opposite of what it should

[Fabian Keil]

Synan B <rsbernt at gmail.com> wrote on 2023-10-25 at 13:10:19:

> FOLLOW-UP QUESTION:
> Is there a way to search for a specific string (like grep/regex) in the 
> User Agent TAG with the PCRE language Privoxy uses, so that the 
> forwarded UA is not nonsensical and is also not hard-coded? Something
> like: TAG:^User-Agent: |/\b(|^User-Agent|||||AppleWebKit|)\b/|

It's not obvious to me what the TAG: above is supposed to match,
especially the "|||||" part seems weird.

In general you can match User-Agent headers with certain
strings with a TAG: line like:

TAG:^User-Agent:.*FreeBSD

While you can also look for multiple strings with groupings
like "(aaa|bbb)" you can simply use multiple TAG lines instead.

> I probably need to create a special filter for this to work?

Filters are used to modify content oder headers so I'm not
sure why you think you need them here.

I would recommend that you only send User-Agent headers that
look valid in which case there shouldn't be any need to rewrite
them.

Fabian
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