How can I cache my site with an .htaccess file?

Creating an .htaccess file on your DreamHost web server

View the following article for instructions on how to create an .htaccess file on your web server:

If the file already exists, view the following articles for instructions on how to update it (depending on if you're using an FTP client or SSH):


DEFLATE is a lossless data compression algorithm similar to gzip, but it works in Apache 2. In the past, mod_gzip was a recommended tool. But DreamHost uses Apache 2 and mod_deflate, which calls gzip on the back end automatically. If you want to, you can add additional encoding types to the filter for things like XML or JSON. For example, add the following to your .htaccess file:

<ifmodule mod_deflate.c>
AddOutputFilterByType DEFLATE text/text text/html text/plain text/xml text/css application/x-javascript application/javascript text/javascript
#End Gzip

View the following page for further details:

Browser caching

Using mod_expires, you can tell visiting browsers to hold on to certain files longer (likes images, which are rarely changed). This .htaccess example shows how to cache specific file types for specific periods of time:

# BEGIN Expire headers  
<ifModule mod_expires.c>  
        ExpiresActive On  
        ExpiresDefault "access plus 5 seconds"  
        ExpiresByType image/x-icon "access plus 2592000 seconds"  
        ExpiresByType image/jpeg "access plus 2592000 seconds"  
        ExpiresByType image/png "access plus 2592000 seconds"  
        ExpiresByType image/gif "access plus 2592000 seconds"  
        ExpiresByType application/x-shockwave-flash "access plus 2592000 seconds"  
        ExpiresByType text/css "access plus 604800 seconds"  
        ExpiresByType text/javascript "access plus 216000 seconds"  
        ExpiresByType application/javascript "access plus 216000 seconds"  
        ExpiresByType application/x-javascript "access plus 216000 seconds"  
        ExpiresByType text/html "access plus 600 seconds"  
        ExpiresByType application/xhtml+xml "access plus 600 seconds"  
# END Expire headers  

Alternately, you can use mod_headers:

# BEGIN Caching
<ifModule mod_headers.c>
<filesMatch "\\.(ico|pdf|flv|jpg|jpeg|png|gif|swf)$">
Header set Cache-Control "max-age=2592000, public"
<filesMatch "\\.(css)$">
Header set Cache-Control "max-age=604800, public"
<filesMatch "\\.(js)$">
Header set Cache-Control "max-age=216000, private"
<filesMatch "\\.(xml|txt)$">
Header set Cache-Control "max-age=216000, public, must-revalidate"
<filesMatch "\\.(html|htm|php)$">
Header set Cache-Control "max-age=1, private, must-revalidate"
# END Caching

See also

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