httpd.conf -- compression
Building a Web Server, for Windows and Linux
Two methods are presented here that allow Apache2 to compress outgoing content; select one.
Note that the client browser has to request compression via headers sent on request.
IE will only request compression on .html, but not on .txt nor .css. Mozilla/Firefox can handle all three types.
LoadModule deflate_module modules/mod_deflate.soLoadModule headers_module modules/mod_headers.so
# Method 1: Only compress specified content type
<Location />
<IfModule mod_deflate.c>
# compress content with type html, text, and css
AddOutputFilterByType DEFLATE text/html text/plain text/css
<IfModule mod_headers.c>
# properly handle requests coming from behind proxies
Header append Vary User-Agent
</IfModule>
</IfModule>
</Location>
# Method 2: Compress all content, manually excluding specified file types
<IfModule mod_deflate.c>
# place filter 'DEFLATE' on all outgoing content
SetOutputFilter DEFLATE
# exclude uncompressible content via file type
SetEnvIfNoCase Request_URI \.(?:gif|jpe?g|png|rar|zip)$ no-gzip
<IfModule mod_headers.c>
# properly handle requests coming from behind proxies
Header append Vary User-Agent
</IfModule>
</IfModule>
# deflate.log, log compression ratio on each request
<IfModule mod_deflate.c>
DeflateFilterNote Input instream
DeflateFilterNote Output outstream
DeflateFilterNote Ratio ratio
LogFormat '"%r" %{outstream}n/%{instream}n (%{ratio}n%%)' deflate
CustomLog logs/deflate.log deflate
</IfModule>
# Properly handle old browsers that do not support compression
<IfModule mod_deflate.c>
BrowserMatch ^Mozilla/4 gzip-only-text/html
BrowserMatch ^Mozilla/4\.0[678] no-gzip
BrowserMatch \bMSIE !no-gzip !gzip-only-text/html
</IfModule>
