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Rules

BIG-IP® Reference Guide 4-57

indicated node address and port. When a rule returns both a pool and a node,

the BIG-IP does not do any additional load balancing or persistence

processing.

Figure 4.30 shows an example of a rule containing a cache statement.

For a complete list of cache statement syntax, see Configuring a remote

origin server, on page 4-64.

Rule-based HTTP redirection

In addition to configuring a rule to select a specific pool, you can also

configure a rule to redirect an HTTP request to a specific location, using the

redirect to operator and a set of format strings included in the BIG-IP. The

location can be either a host name, port number, or URI. The format strings

are: %h, %p, and %u. These format strings can be used within a

redirection string to indicate which parts of the string (host name, port

number, and URI path) do not indicate a redirection.

For example, the string https://%h:443/%u specifies that the HTTP request

is to be redirected to a different protocol (https instead of the standard http)

and a different port number (443). The host name and the URI path remain

the same, indicated by the %h and %u format strings.

Figure 4.31 shows a rule that is configured to redirect an HTTP request.

Figure 4.31 A rule based on HTTP redirection

rule my_rule {

if ( http_host starts_with "dogfood" ) {

cache ( http_uri ends_with "html" or http_uri ends_with "gif" ) {

origin_pool origin_server

cache_pool cache_servers

hot_pool cache_servers

hot_threshold 100

cool_threshold 10

hit_period 60

content_hash_size 1024

}

else {

use ( cathost named_servers )

}

Figure 4.30 An example of a cache load balancing rule

rule my_rule {

if (http_uri ends_with "baz") {

redirect to "https://%h:8080/%u/"

}

else {

use (web_pool)

}

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