Using iruel for redirects

here is the classi amusing for testing

 

 

class TURL_List {

 

"www.thermo.com/centrifugation http://www.thermo.com/cda/category/category_lp

 

/0,2152,53,00.html"

 

"www.thermo.com/histology http://www.thermo.com/com/cda/category/category_lp/

 

0,2152,211,00.html"

 

}

 

 

here is the irule

 

 

when HTTP_REQUEST {

 

set req "[HTTP::host]/[getfield [HTTP::uri] "/" 2]"

 

set redir [findclass $req $::TURL_List]

 

if {$redir !=""}{

 

HTTP::redirect $redir

 

}

 

}

 

 

when i hit www.thermo.com, i get this malformed http request

 

 

http://www.thermo.com/histology%20http://www.thermo.com/com/cda/category/category_lp/0,2152,211,00.html

ah, yes, I omitted the separator character from the findclass command. Without it, the entire row is returned; with it, only the portion after the first separator is returned.

This should work better:

rule URIredirects {
  when HTTP_REQUEST {
    set req "[HTTP::host]/[getfield [HTTP::uri] "/" 2]"
    set redir [findclass $req $::myRedirects " "]
    if {$redir !=""}{
      log local0. "Redirecting request for [HTTP::host][HTTP::uri] to $redir"
      HTTP::redirect $redir
    }
  }
}

I also added a log line to assist in troubleshooting that logs the redirect value -- once you've got it working, delete that for production use.

/d

Works like a charm. Thanks for all your help. We can re-commence the singing of songs of joy!

Posted By deb on 05/02/2007 12:49 PM

 

 

oh, sorry, they are still called classes in the config, but I keep forgetting they are now called "Data Group Lists" in the GUI and doc.

 

 

You can just browse in the GUI to Local Traffic/iRules, click on the Data Group List tab, and create a new list of type "String". Add your list, one row at a time, with a space separating the host/uri and the redirect (GUI will add the double quotes for you).

 

 

Class lists are stored in the bigip.conf file, and are loaded into memory with the rest of the config. We have customers using very large class lists with simple iRules such as this with minimal performance impact.

 

 

/deb

 

 

 

wow.. awesome post.. wish this was documented somewhere other than in the middle of a random thread