Reference Guide

Zend Server Reference Manual
This sets the Page Cache to cache content only when the _SESSION parameter
'username' is not set. Subsequently, users that do have the _SESSION
'username' set are presented with a live version of the page.
If necessary, we can extend this limit to include all users whose 'username'
_SESSION parameter equals 'guest' as follows:
Note:
Square brackets are not required for non-nested variables when referring to superglobal
variables in caching conditions. If you do not use square brackets, the system adds them
automatically after you click "Save".
This completes creating a Cache Rule.
Multiple Versions of Cached Pages
1. Choose to create compressed cache copies.
This option allows you to disable the creation of a gzip-compressed version of each
cached page, as long as it is larger than 1KB. You should normally leave this option
checked.
By default, Zend Server creates a compressed version of each cached page and stores it
alongside the original version. This compressed version is sent to browsers that support
gzip compression (all modern browsers support this) instead of the uncompressed
version. For typical HTML, XML or other text-based outputs, using the compressed
version can save about 90% of the bandwidth and improve page load times. In addition,
the compressed copy is saved in your cache so the CPU-intensive process of real-time
compression is not required. However, if you are caching a PHP script that outputs binary
data (for example JPEG or PNG images, ZIP or EXE files, PDFs, etc.) which cannot be
further compressed, you should un-check this option to avoid redundant processing. For
more information, see: Page Cache.
2. Click to create different cached copies according to specific
values. This creates more than one version of the page in the cache, based on specific
conditions.
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