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Blue Coat Systems Time Clock Proxy SG Manuale Utente

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Chapter 6: Definition Reference
261
define url condition
Binds a user-defined label to a set of URL prefix patterns for use in a 
condition=
 expression. Using 
this definition block allows you to quickly test a large set of 
url=
 conditions. Although the 
define 
condition
 definition block could be used in a similar way to encapsulate a set of URL prefix patterns, 
this specialized definition block provides a substantial performance boost. 
The manner in which the URL patterns and any condition expressions are listed is significant. Each 
line begins with a URL pattern suitable to a 
url=
 condition and, optionally, one or more condition 
expressions, all of which have a Boolean AND relationship. Each line inside the definition block is 
considered to have a Boolean OR relationship with other lines in the block.
Syntax
define url condition label
url_prefix_pattern [condition_expression ...]
...
end [url condition label]
where:
•
label
—A user-defined identifier for a prefix condition definition.
•
url_prefix_pattern
 ... —A URL pattern that includes at least a portion of the following:
scheme://host:port/path
❐
scheme
—A URL scheme (
http
, https, ftp, mms, or rtsp) followed by a colon (:).
❐
host
—
A host name or IP address, optionally preceded by two forward slashes (
//
). Host 
names must be complete; for example,
 url=http://www 
will fail to match a URL such as
 
http://www.example.com
. 
This use of a complete host instead of simply a domain name 
(such as 
example.com
) marks the difference between the prefix and domain condition 
definition blocks.
❐
port
—A port number, between 1 and 65535
.
❐
path
—A forward slash (
/
) followed by one or more full directory names. 
Accepted prefix patterns include the following:
scheme://host
scheme://host:port
scheme://host:port/path
scheme://host/path 
//host
//host:port
//host:port/path
//host/path
host
host:port
host:port/path
host/path
/path
•
condition_expression
 ...—An optional condition expression, using any of the conditions 
available in a rule. For more information, see Chapter 3: "Condition Reference". The layer and