Leveraging Browser Caching - Expires/Cache control for CSS/Images

After running a google Speed Test, one of the items is to "Leverage Browser Caching".

How do you set these values for static images or css files? T开发者_C百科his site uses CodeIgniter (php) and apache.

Thank you!

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In your Apache config:

# Make stuff cacheable
ExpiresActive On
ExpiresDefault "access plus 1 day"

# Typically dynamic PHP content
ExpiresByType text/html "access plus 0 seconds"

# PDF files don't need to be cached either
ExpiresByType application/pdf "access plus 0 seconds"

The rules should be fairly self-explanatory.

You can set this globally, as above, and per virtual host:

<Directory "/var/www/example.com">
        # Cache longer
        ExpiresDefault "access plus 1 year"
</Directory>

Recommended reading: Caching Tutorial, Apache Caching Guide