... Directives | ... Apache HTTP Server Version 2.0 . Apache > HTTP Server > Documentation > Version 2.0 > How-To / Tutorials . ... Server-side includes provide a means to add dynamic content to existing HTML documents. ... What are SSI? ... SSI (Server Side Includes) are directives that are placed in HTML pages, and evaluated on the server while the pages are being served. ... To permit SSI on your server, you must have the following directive either in your httpd.conf file, or in a .htaccess file: . ...