[http::host] inside "when rule_init"

Hi,

I am very new to this irule scripting, frankly saying first time i am using. I am planning to use the below code snippet for redirecting urls

when RULE_INIT

{

switch -glob [string tolower [HTTP::host]]

{

"*xxx*"

{

set static::external "xxx.abc.com"

set static::internal "xxx.internet.abc.com"

}

"*yyy*"

{

set static::external "yyy.abc.com"

set static::internal "yyy.internet.abc.com"

}

"*zzz*"

{

set static::external "zzz.abc.com"

set static::internal "zzz.internet.abc.com"

}

}

}

based on the external and internal value there is some other logic involved in "when HTTP_REQUEST" and "when HTTP_RESPONSE", my doubt is will [HTTP::host] get the value inside "when RULE_INIT". will the above snippet works? if not what is the solution for that?

Thanks in advance

Ganesh.