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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