See also bug T56291 for related config for upload.wikimedia.org.
We're using more and more little SVG files for style effects and icons used in MediaWiki client-side code; when not directly embedded in CSS these get loaded as static files off of bits.wikimedia.org and by default are not compressed, for example http://bits.wikimedia.org/static-1.23wmf13/extensions/CirrusSearch/cirrus-beta.svg on the beta features page.
While these are often not huge, they do compress very well (as XML source) and it'd be nice to auto-compress them on the wire.
URL: http://bits.wikimedia.org/static-1.23wmf13/extensions/CirrusSearch/cirrus-beta.svg
See Also:
T6947: SVGZ (gzipped SVG) support
T56291: Apply Transfer-encoding: gzip to SVG files from upload.wikimedia.org