iRules for reverse proxy

Your request for information is is pretty broad, but I will give you an example. You must decide what is good traffic in order to route it to a specific pool of servers, and what to do with the rest of the traffic (whether it is bad or doesn't meet any of the criteria set earlier in the iRule).

Here is an example. You have one website that contains conent for three different languages:

http://www.website.com/english

http://www.website.com/french

http://www.website.com/german

You divide your web servers into different pools that host a certain language, and now you must route the traffic to each set of servers depending on the URI.

[HTTP::host] = www.website.com

[HTTP::uri] = /english, /french, or /german

You would place this iRule on the Virtual Server:

when HTTP_REQUEST {
   switch -glob [string tolower[HTTP::uri]] {
     "/english*" { pool pool.for.english }
     "/french*" { pool pool.for.french }
     "/german*" { pool pool.for.german }
     default  { HTTP::redirect http://[getfield [HTTP::host] ":" 1]/english }
   }
}

Is this the type of information you were looking for?