Apacha Mod Deflate

 A few notes as to how to use mod deflate in Apache 2.*.

Typical .htaccess vhost configuration.

<IfModule mod_deflate.c>
SetOutputFilter DEFLATE

# example of how to compress ONLY html, plain text and xml
# AddOutputFilterByType DEFLATE text/plain text/html text/xml



# Don't compress binaries
SetEnvIfNoCase Request_URI .(?:exe|t?gz|zip|iso|tar|bz2|sit|rar) no-gzip dont-vary



# Don't compress images
SetEnvIfNoCase Request_URI .(?:gif|jpe?g|jpg|ico|png) no-gzip dont-vary



# Don't compress PDFs
SetEnvIfNoCase Request_URI .pdf no-gzip dont-vary



# Don't compress flash files (only relevant if you host your own videos)
SetEnvIfNoCase Request_URI .flv no-gzip dont-vary



# Netscape 4.X has some problems
BrowserMatch ^Mozilla/4 gzip-only-text/html



# Netscape 4.06-4.08 have some more problems
BrowserMatch ^Mozilla/4.0[678] no-gzip



# MSIE masquerades as Netscape, but it is fine
BrowserMatch bMSIE !no-gzip !gzip-only-text/html



# Make sure proxies don't deliver the wrong content
Header append Vary User-Agent env=!dont-vary



# Setup custom deflate log
DeflateFilterNote Input instr
DeflateFilterNote Output outstr
DeflateFilterNote Ratio ratio
LogFormat '"%r" %{outstr}n/%{instr}n %{ratio}n%%' DEFLATE
CustomLog logs/deflate_log DEFLATE
</IfModule>

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