sample irule for redirect / rewrite

Scenario is a single monolithic site being broken-up into micro-sites - but not in one fell swoop, so all sites must co-exist for a period of time.

 

 

Micro-sites are deployed with natural-language urls that each are mapping to an old-style url that is handled by the monolithic site server.

 

 

So the need for redirects is motivated by SEO.

 

 

In addition to redirects, also have need perform invisible rewrites of the natural language URLs to the the old-style URLs ( handled by the monolithic site ).

 

 

QUESTION : how exactly should I perform the rewrite ? I've seen rewrite iRules written like this :

 

 

when HTTP_REQUEST {

 

if { [class match [string tolower [HTTP::uri]] starts_with rewrites_datagroup] } {

 

HTTP::uri "http://[class match -value [string tolower [HTTP::uri]] starts_with rewrites_datagroup]"

 

}

 

}

 

 

But what I find strange is that the apparently there's no need to specify the destination pool ... ?

 

 

So how exactly does the request find its way to the pool ?