handling parameter in query_string with mod_rewrite

[Stefano Nichele <stefano.nichele@xxxxxxxxx>]

Hi All,
I would need some help with mod_rewrite :-( .
What I would need is to add an header to the response if the request 
contains a URL parameter and the value of that parameter should be used 
in that header.

Just  to clarify, if the url is:

/download/files/1ytreefecsw?filename=myfile.txt

I would like to return this file /download/files/1ytreefecsw setting in 
the response "Content-disposition" header with value myfile.txt:

"Content-disposition: attachment; filename=myfile.txt

I was able to do this thing checking a request header using:
    SetEnvIf x-filename "^(.+)$" FILENAME=$1
    Header set "Content-disposition" "attachment; 
filename=%{FILENAME}e" env=FILENAME

but now i need to do similar thing using a parameter.

I understand that there is not a simple way to access to the 
query_string and actually this is not possible using SetEnvIf and it 
seems the right way  is using mod_rewrite .... but i don't find the 
solution.
At the moment i'm trying something like:

    RewriteEngine on
    RewriteRule   ^(.*)filename=(.*)$  $1 [E=FILENAME:$2]
    Header set "Content-disposition" "attachment; 
filename=%{FILENAME}e" env=FILENAME

but it doesn't work  :-((

Could you help me ?

Thanks
ste


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