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 Cirrus rankCirrus
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
    }
   }
  • myself_85560's avatar
    myself_85560
    Icon for Nimbostratus rankNimbostratus
    Jun 02, 2016
    Tahnks Yann! You are awesome! Quick question, would this iRule work for POST methods as well. Please advise. thanks