Code:
#CUSTOM
# START: MOD_EXPIRES
ExpiresActive On
# Set Images to Expire After a Month
ExpiresByType image/gif "access plus 1 month"
ExpiresByType image/png "access plus 1 month"
ExpiresByType image/jpeg "access plus 1 month"
ExpiresByType image/x-icon "access plus 1 month"
# Set CSS/JS to Expire After a Month
ExpiresByType text/css "access plus 1 month"
ExpiresByType application/javascript "access plus 1 month"
#SetOutputFilter DEFLATE
AddOutputFilter DEFLATE xhtml html htm php css js xml xsl txt plain javascript x-javascript ico
# END: MOD_EXPIRES
Header unset Pragma
FileETag None
Header unset ETag
# 1 YEAR
<FilesMatch "\.(ico|pdf|flv)$">
Header set Cache-Control "max-age=29030400, public"
</FilesMatch>
# 1 WEEK
<FilesMatch "\.(jpg|jpeg|png|gif|swf)$">
Header set Cache-Control "max-age=604800, public"
</FilesMatch>
# 2 DAYS 172800
<FilesMatch "\.(xml|txt|css|js)$">
Header set Cache-Control "max-age=604800, proxy-revalidate"
</FilesMatch>
# 1 MIN
<FilesMatch "\.(html|htm)$">
Header set Cache-Control "max-age=240, private, proxy-revalidate"
</FilesMatch>
<FilesMatch "\.(ico|pdf|flv|jpg|jpeg|png|gif|js|css|swf)$">
Header set Expires "Thu, 20 Dec 2012 20:00:00 GMT"
</FilesMatch>
<IfModule mod_mime.c>
AddType text/css .css
AddType application/x-javascript .js
AddType text/richtext .rtf .rtx
AddType image/svg+xml .svg .svgz
AddType text/plain .txt
AddType text/xsd .xsd
AddType text/xsl .xsl
AddType text/xml .xml
AddType image/bmp .bmp
AddType application/java .class
AddType image/gif .gif
AddType application/x-gzip .gz .gzip
AddType image/x-icon .ico
AddType image/jpeg .jpg .jpeg .jpe
AddType application/vnd.ms-access .mdb
AddType application/pdf .pdf
AddType image/png .png
AddType application/x-shockwave-flash .swf
AddType image/tiff .tif .tiff
AddType application/zip .zip
</IfModule>
<IfModule mod_expires.c>
ExpiresActive On
ExpiresByType text/css A31536000
ExpiresByType application/x-javascript A31536000
ExpiresByType text/richtext A3600
ExpiresByType image/svg+xml A3600
ExpiresByType text/plain A3600
ExpiresByType text/xsd A3600
ExpiresByType text/xsl A3600
ExpiresByType text/xml A3600
ExpiresByType image/bmp A31536000
ExpiresByType application/java A31536000
ExpiresByType image/gif A31536000
ExpiresByType application/x-gzip A31536000
ExpiresByType image/x-icon A31536000
ExpiresByType image/jpeg A31536000
ExpiresByType application/vnd.ms-access A31536000
ExpiresByType application/pdf A31536000
ExpiresByType image/png A31536000
ExpiresByType application/x-shockwave-flash A31536000
ExpiresByType image/tiff A31536000
ExpiresByType application/zip A31536000
</IfModule>
AddOutputFilterByType DEFLATE text/html text/xml text/css text/plain
AddOutputFilterByType DEFLATE image/svg+xml application/xhtml+xml application/xml
AddOutputFilterByType DEFLATE application/rdf+xml application/rss+xml application/atom+xml
AddOutputFilterByType DEFLATE text/javascript application/javascript application/x-javascript
AddOutputFilterByType DEFLATE application/x-font-ttf application/x-font-otf
AddOutputFilterByType DEFLATE font/truetype font/opentype
<IfModule mod_deflate.c>
<IfModule mod_setenvif.c>
BrowserMatch ^Mozilla/4 gzip-only-text/html
BrowserMatch ^Mozilla/4\.0[678] no-gzip
BrowserMatch \bMSIE !no-gzip !gzip-only-text/html
BrowserMatch \bMSI[E] !no-gzip !gzip-only-text/html
</IfModule>
<IfModule mod_headers.c>
Header append Vary User-Agent env=!dont-vary
</IfModule>
AddOutputFilterByType DEFLATE text/css application/x-javascript text/html text/richtext image/svg+xml text/plain text/xsd text/xsl text/xml image/x-icon
</IfModule>
<FilesMatch "\.(css|js)$">
<IfModule mod_headers.c>
Header set Pragma "public"
Header set Cache-Control "public, must-revalidate, proxy-revalidate"
</IfModule>
FileETag MTime Size
<IfModule mod_headers.c>
Header set X-Powered-By "W3 Total Cache/0.9.1.3"
</IfModule>
</FilesMatch>
<FilesMatch "\.(html|htm|rtf|rtx|svg|svgz|txt|xsd|xsl|xml)$">
<IfModule mod_headers.c>
Header set Pragma "public"
Header set Cache-Control "public, must-revalidate, proxy-revalidate"
</IfModule>
FileETag MTime Size
<IfModule mod_headers.c>
Header set X-Powered-By "W3 Total Cache/0.9.1.3"
</IfModule>
</FilesMatch>
<FilesMatch "\.(asf|asx|wax|wmv|wmx|avi|bmp|class|divx|doc|docx|exe|gif|gz|gzip|ico|jpg|jpeg|jpe|mdb|mid|midi|mov|qt|mp3|m4a|mp4|m4v|mpeg|mpg|mpe|mpp|odb|odc|odf|odg|odp|ods|odt|ogg|pdf|png|pot|pps|ppt|pptx|ra|ram|swf|tar|tif|tiff|wav|wma|wri|xla|xls|xlsx|xlt|xlw|zip)$">
<IfModule mod_headers.c>
Header set Pragma "public"
Header set Cache-Control "public, must-revalidate, proxy-revalidate"
</IfModule>
FileETag MTime Size
<IfModule mod_headers.c>
Header set X-Powered-By "W3 Total Cache/0.9.1.3"
</IfModule>
</FilesMatch>