Citrix Systems 9.2 Benutzerhandbuch

You can extract URLs and portions of URLs, such as the host name, or a segment 
of the URL path. For example, the following expression identifies HTTP requests 
for image files by extracting image file suffixes from the URL:

http.req.url.suffix.eq("jpeg") || http.req.url.suffix.eq("gif")

Most expressions for URLs operate on text and are described in 

. This section 

discusses the GET operation. The GET operation extracts text when used with the 
following prefixes:

•

HTTP.REQ.URL.PATH

•

VPN.BASEURL.PATH

•

VPN.CLIENTLESS_BASEURL.PATH

Cache-Control header.

MAX_AGE

Returns the value of the Cache-Control header Max-
Age. If this header is absent or invalid, 0 is returned.

Following is an example:

http.req.cache_control.max_age.le(3)

Cache-Control header.

MAX_STALE

Returns the value of the Cache-Control header Max-
Stale. If this header is absent or invalid, 0 is returned.

Following is an example:

http.req.cache_control.max_stale.le(3)

Cache-Control header.

MIN_FRESH

Returns the value of the Cache-Control header Min-
Fresh. If this header is absent or invalid, 0 is returned.

Following is an example:

http.req.cache_control.min_fresh.le(3)

Cache-Control header.S_

MAXAGE

Returns the value of the Cache-Control header S-
Maxage. If this header is absent or invalid, 0 is returned.

Following is an example:

http.req.cache_control.s_maxage.eq(2)