Coyote Point Systems Equalizer Especificações descarregar pdf (Página 322)

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101

Match Rules

!expression

giving rise to the next simplest example:

!any()

which always evaluates to

false

and always results in the match rule not being selected.

With the addition of the logical OR (||) and logical AND (&&) operators, you can specify complex expressions,

selecting precise attributes from the request, as in this:

!happy() || (round() && happy())

Match expressions are read from left to right. Expressions contained within parentheses get evaluated before other

parts of the expression. The previous expression would match anything that was not happy or that was round and

happy.

Unlike the previous example, match functions correspond to certain attributes in a request header.

For example, a request URI for a web page might look like this:

\Get /somedir/somepage.html http/1.1

Accept: text/html, text/*, *.*

Accept-Encoding: gzip

Host: www.coyotepoint.com

User-Agent: Mozilla/4.7 [en] (Win98; U)

Various functions return true when their arguments match certain components of the request URI. Using the above

request URI, for example, you could use several match functions:

l pathname() return

s true if its argument matches

/somedir/somepage.html

l dirname() retu

rns true if its argument matches

/somedir/

l filename() retu

rns true if its argument matches

somepage.html

Other functions can evaluate the contents of the Host header in the request URI above:

host (www.coyotepoint.com)

host_prefix (www)

host_suffix (coyotepoint.com).

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