Similar to the ad-banner-rotation applet, the SSI applet allows expansion of Server-Side Include (SSI) (5, 5) variables at the proxy site, thus allowing the correct caching of SSI-based dynamic documents. The applet scans the cached document, and for each specially marked SSI variable, update the value of the variable in the document, and put the new document in New_File. The proxy can correctly expand variables DATE_GMT, DATE_LOCAL, REMOTE_ADDRESS, and REMOTE_HOST. Other SSI variables are typically related to the server and do not change from request to request.