Re: need to write a fitler based on request header

[Torsten Foertsch <suppressed>]

On Thu 28 Feb 2008, J. Peng wrote:
> currently I write it with PerlAccessHandler, it also works. is it
> right with this handler?

Do you want to send a redirect to the browser (HTTP code 3xx)? If yes then it 
can be done in an access handler as well. If you simply want to send the 
document in /pathA or /pathB then I think you'd prefer something *before* the 
core map_to_storage handler, that means a PerlTransHandler or a 
PerlMapToStorageHandler since otherwise you'd need to fill out the finfo 
field by yourself, see

 http://perl.apache.org/docs/2.0/api/Apache2/RequestRec.html#C_finfo_

> no, mod_rewrite can't rewrite requests based on Accept-Encoding header.

yes, something like this:

RewriteCond %{HTTP:Accept-Encoding} gzip [OR]
RewriteCond %{HTTP:Accept-Encoding} deflate
RewriteRule ^(.*) /pathA/$1 [PT,L]

RewriteRule ^(.*) /pathB/$1 [PT,L]

or as an external redirect:

RewriteCond %{HTTP:Accept-Encoding} gzip [OR]
RewriteCond %{HTTP:Accept-Encoding} deflate
RewriteRule ^(.*) /pathA/$1 [R,L]

RewriteRule ^(.*) /pathB/$1 [R,L]

Why do you think this wouldn't work?

> On Thu, Feb 28, 2008 at 7:26 PM, Torsten Foertsch
>
> <suppressed> wrote:
> > On Thu 28 Feb 2008, J. Peng wrote:
> >  > I need to write an input filter based on the request headers.
> >  > If request includes a "Accept-Encoding: gzip, deflate" header, I
> >  > should redirect the request to /pathA.
> >  > If request doesn't include that header, I should redirect the request
> > to > /pathB. (pathA and pathB are web document dirs on web server.)
> >
> >  I think you don't need an input filter. What you need is a
> > PerlTransHandler or a PerlMapToStorageHandler that checks
> > $r->headers_in->{'Accept-Encoding'} and sets $r->filename and/or $r->uri
> > accordingly.
> >
> >  This can even be done with mod_rewrite.

Torsten

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