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No matter how I test using different value of Accept-Encoding, it always returned as gzip.

curl -I -H  'Accept-Encoding: gzip'
Content-Encoding: gzip

curl -I -H  'Accept-Encoding: deflate'
Content-Encoding: gzip

So how to force deflate?

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You probably don't want to use deflate.… – sciurus Mar 30 '12 at 4:14
Do you have mod_deflate enabled and configured? – Eli Sand Apr 4 '12 at 0:54
up vote 0 down vote accepted

You can't. mod_deflate only ever responds with Content-Encoding: gzip.

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