Forum Discussion

myself_85560's avatar
myself_85560
Icon for Nimbostratus rankNimbostratus
Jun 01, 2016

LB decisions matching the headers

Hi, We have a custom written application that is being hosted on multiple servers behind the LTM. It does not use cookies rather a variety of unique http headers. I need to use these unique headers t...
application delivery
iRules
LTM
  • Yann_Desmarest_'s avatar
    Yann_Desmarest_
    Jun 02, 2016

    Hi,

    I would recommend the modified irule below, changed second if by elseif. Otherwise, If you match the first if you also match the else and you will have a tcl error and a tcp reset on thz client side :

    when HTTP_REQUEST {
if { [class match [HTTP::header "online.protocol.remote.contenttype"] equals header_value_1] } {
        pool_1
    }
elseif { [class match [HTTP::header "online.protocol.remote.contenttype"] equals header_value_2] } {
        pool_2
    } 
    else {
        pool_3
    }
   }
Yann_Desmarest_'s avatar
Yann_Desmarest_
Icon for Nacreous rankNacreous

Hi,

You can take the below irule as example, I assumed that you were talking about uri not headers but correct me if I'm wrong : 

when HTTP_REQUEST {
    switch -glob [HTTP::uri] {
        "*TEST/Rumba/mountainisred@4*" -
        "*TEST/Rumba/mountainisblue@2*" -
        "*TEST/Rumba/mountainisorange@2*" -
        "*TEST/Rumba/mountainisgreen@2*" {
            pool_1
        }
        "*TEST/Rumba/mountainispink@2*" -
        "*TEST/Rumba/mountainisgray@2*" -
        "*TEST/Rumba/mountainiswhite@2*" -
        "*TEST/Rumba/mountainisblack@2*" {
            pool_2
        }
        default {
            pool_3
        }

    }
}
myself_85560's avatar
myself_85560
Icon for Nimbostratus rankNimbostratus
Jun 01, 2016
Thanks Yann for your quick response. Nope. Its not the uri but headers. I am sure. I have seen the headers. The headers has 3 or 4 lines of unique strings. I took out one of them, that are widely looks a similar type across all the headers. Does that makes any difference if it is a POST rather than a GET.