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Chapter 4: Configuring the High-Level Network

4-58

The preceding rule applies the format string to the URL. In this case, the

format string sets the protocol to https, strips the requested port number (if

any), and changes it to 8080, and applies a trailing slash (/) to the end of the

URI, if the URI ends with the string baz.

Note

The %u format string strips the first character of the URI path. This is

usually a slash (/), and this modification is done purely for aesthetic

reasons. Thus when describing a URL, the string http://%h/%u is used

instead of http://%h%u.

For more information on HTTP redirection and format strings, see HTTP

redirection, on page 4-37.

Rule statements

A rule consists of statements. Rules support the following types of

statements:

•An if statement asks a true or false question and, depending on the

answer, takes some action.

•A discard statement discards the request. This statement must be

conditionally associated with an if statement.

•A use statement uses a selected pool for load balancing. This statement

must be conditionally associated with an if statement.

•A cache statement uses a selected pool for load balancing. This

statement can be conditionally associated with an if statement.

•A redirect statement sends traffic to a specific destination, rather than to

a pool for load balancing.

The primary possible statements expressed in command line syntax are:

if (<question>) {<statement>} [else {<statement>}]

discard

use ( <pool_name> )

cache ( <expressions> )

redirect ( <redirect URL> )

For detailed syntax of these rules statements, see To define a rule from the

command line, on page 4-63.

Questions (expressions)

A question or expression is asked by an if statement and has a true or false

answer. A question or expression has two parts: a predicate (operator), and

one or two subjects (operands).

There are two types of subjects (operands); some subjects change and some

subjects stay the same.

• Changing subjects are called variable operands.

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