Server Configuration

Internet Explorer has caching problems that may affect the performance of the htmlArea RTE. These problems may be worked around with the following server configuration recommendations.

Apache configuration:

Add the following lines to your Apache httpd.conf file or in the .htaccess file of the root directory of your site:

BrowserMatch "MSIE" brokenvary=1
BrowserMatch "Mozilla/4.[0-9]{2}" brokenvary=1
BrowserMatch "Opera" !brokenvary
SetEnvIf brokenvary 1 force-no-vary

ExpiresActive On
ExpiresByType image/gif "access plus 1 month"
ExpiresByType image/png "access plus 1 month"

The last two statements require the mod_expires Apache module to be installed. For information on this module, see:

http://httpd.apache.org/docs/2.4/mod/mod_expires.html

Microsoft IIS configuration:

See: http://www.aspnetresources.com/blog/cache_control_extensions.aspx

More information:

For more information on this subject, see the following articles:

http://dean.edwards.name/my/flicker.html

http://httpd.apache.org/docs/2.4/mod/mod_expires.html

http://fivesevensix.com/studies/ie6flicker/

See also the Troubleshooting section of the present document for information on IE caching problems in relation with the Apache mod_gzip module.