It seems to me, that mod_deflate in Apache 2.2 will always return:
It was explained to me, that although there may be a deflate algorithm, mod_deflate is named after a file-format, in which the algorithm could be any of:
gzip, bzip. pkzip
Of those three, mod_deflate provides gzip.
It seems as though gzip is the most popular and widely-supported algorithm in web browsers, but I know some web servers and proxies do return Content-Encoding: deflate.
Aside from the confusion of the module's name, it true that mod_deflate will only return Content-Encoding: gzip?