[users@httpd] Generate 304 (not modified) response with mod_ext_filter

[Phil Endecott <sp...@chezphil.org>]

Dear All,

I'm using mod_ext_filter to convert SVG files to PNG on the fly.  It 
looks something like this:

ExtFilterDefine render_svg_filter mode=output \
intype=image/svg+xml outtype=image/png \
cmd="/usr/local/bin/rsvg_filter.sh"

where rsvg_filter is something like:

#!/bin/sh
tmpinfile="/tmp/rsvg.$$.dt"
tmpoutfile="/tmp/rsvg.$$.png"
cat > $tmpinfile
rsvg $tmpinfile $tmpoutfile
cat $tmpoutfile
rm $tmpoutfile $tmpinfile


This works well.

Unfortunately, it looks as if the PNGs that this generates are not being 
cached by the browser.  Presumably the browser is sending an 
if-modified-since header; I'd like to compare the if-modified-since date 
with the timestamp on the .svg file, and return a 304 not modified 
response if nothing has changed.

(I'm not sure how this interacts with Etags.)

Is there a way to do this?

Thanks for any ideas.

--Phil.



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