This dialog box lets you specify object headers that the appliance recognizes as overriding standard HTTP cache directives. The dialog box has two options that let you specify how the appliance refills objects with custom cache control headers when the objects expire in cache.
Control Header
This list contains the currently defined control headers. Use the
add and delete buttons to define new control headers or delete those
in the list.
Always get a new copy of object
If you check this option, when objects expire in cache and are subsequently
requested by a browser, they are refilled in cache and their expiration
timer is set to the custom cache control header value. The proxy server
doesn't check to see whether objects have changed on the origin Web server.
Use If-Modified-Since request to verify cached copy is correct
If you check this option, when objects expire in cache and are subsequently
requested by a browser, they are refilled in cache only if they have changed
on the origin Web server. Otherwise they are retained in cache and their
expiration timer is set to the custom cache control header value.
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