Posted Mar 1, 2013 13:49 UTC (Fri) by huayra (subscriber, #58915)
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It should be possible, but it would be more interesting doing it in Varnish itself.
CSS and JS minification on a do_minify has been done before, using the same code logic and strategy used for the do_gzip compression support (even keeping the compressed ESI goodness). So replacing gzip or adding this new library and keep gunzip for decompression, could be an idea.