<IfModule mod_deflate.c>

    #General Configuration settings: use ratio method and highest compression
    DeflateFilterNote ratio
    DeflateCompressionLevel 9
    
    #Approach 1: Implicit ("Set") compression
    ## There are potential issues with compressing everything    
    ## It will for example send xml compressed to web services or flash
    #SetOutputFilter DEFLATE
    #SetEnvIfNoCase Request_URI \.(?:gif|jpe?g|png)$ no-gzip dont-vary
    #SetEnvIfNoCase Request_URI \.(?:exe|t?gz|zip|bz2|sit|rar)$ no-gzip dont-vary
    #SetEnvIfNoCase Request_URI \.pdf$ no-gzip dont-vary
    #SetEnvIfNoCase Request_URI \.avi$ no-gzip dont-vary
    #SetEnvIfNoCase Request_URI \.mov$ no-gzip dont-vary
    #SetEnvIfNoCase Request_URI \.mp3$ no-gzip dont-vary
    #SetEnvIfNoCase Request_URI \.mp4$ no-gzip dont-vary
    #SetEnvIfNoCase Request_URI \.rm$ no-gzip dont-vary
    
    ##Approach 2: Explicit ("Add") compression by mime-type
    
    AddOutputFilterByType DEFLATE application/x-httpd-php
    AddOutputFilterByType DEFLATE application/x-httpd-fastphp
    AddOutputFilterByType DEFLATE application/x-httpd-eruby
    AddOutputFilterByType DEFLATE text/html

    # Or by extension
    # AddOutputFilter DEFLATE html
    AddOutputFilterByType DEFLATE text/plain
    AddOutputFilterByType DEFLATE text/xml
    AddOutputFilterByType DEFLATE application/xhtml+xml
    AddOutputFilterByType DEFLATE text/css
    AddOutputFilterByType DEFLATE application/xml
    AddOutputFilterByType DEFLATE image/svg+xml
    AddOutputFilterByType DEFLATE application/rss+xml
    AddOutputFilterByType DEFLATE application/atom_xml
    AddOutputFilterByType DEFLATE application/x-javascript
    
    # Implicit compression on the way in
    SetInputFilter DEFLATE
    
    # Explicit compression on the way in, there is no AddInputFilterByType
    # AddInputFilter DEFLATE html
    
    # Testing
    DeflateFilterNote Input input_info
    DeflateFilterNote Output output_info
    DeflateFilterNote Ratio ratio_info
    LogFormat '"%r" %{output_info}n/%{input_info}n (%{ratio_info}n%%)' deflate
</IfModule>

<tt>LoadModule deflate_module modules/mod_deflate.so
LoadModule 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></tt>