Don't compress things that are already GZIPped in the compression filter.
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Key: GEOS-2085
URL: http://jira.codehaus.org/browse/GEOS-2085
Project: GeoServer
Issue Type: Improvement
Reporter: David Winslow
Assignee: Andrea Aime
The GZIP compression filter goes only by the mimetype of the data it encodes. When that data is compressed at a lower level, this results in twice-compressed data which is computationally wasteful aside from not working in most web browsers 
Do some magic to check whether the content is already compressed before starting to compress output.
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