[privoxy-users] [ ijbswa-Support Requests-3136930 ] Want to detect pattern in first 8chars of response>redirect

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Support Requests item #3136930, was opened at 2010-12-14 01:39
Message generated for change (Comment added) made by fabiankeil
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Category: actions files
Group: None
>Status: Pending
Priority: 5
Private: No
Submitted By: https://www.google.com/accounts ()
>Assigned to: Fabian Keil (fabiankeil)
Summary: Want to detect pattern in first 8chars of response>redirect

Initial Comment:
Hi, I have successfully used 'redirect' on requests but am wondering if I can use it on responses? i.e. 
I want to inspect the first 8 characters of the response body (if there is one) and then effectively
redirect the request url (that produced that response) to a different server that will produce the response.

Is this possible with Privoxy? 

I was thinking I might need to use:
   force-text-mode
   filter (but only for detection, not to change any data)
   client-header-tagger
   server-header-tagger
But, I'm not quite sure how it will work? Any help appreciated. Thanks.

John B. Hansen

FYI: I'm currently using Privoxy 3.0.12-stable but hope to upgrade to 3.0.17-stable soon.



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>Comment By: Fabian Keil (fabiankeil)
Date: 2010-12-14 18:17

Message:
While actions can be applied based on response headers (using the
server-header-tagger action), enabling them based on the response body is
currently not possible (as there's no server-response-tagger action).

What kind of responses do you expect? Maybe it's possible to differentiate
them based on the headers.

You could also use an ordinary filter to replace the content delivered by
the server with a HTML redirect, but this will only work in situations
where the client expects HTML.

Anyway, if you don't mind hacks, you should be able to achieve your goal
by chaining two Privoxy instances.

Let the first one replace responses that should be redirected with a
response with a length unlikely to occur on the web and let the second
instance redirect based on the Content-Length header added by the first
instance. For Content-Length server headers, single digit values other than
0 are pretty rare.

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