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Forum Discussion

SteveVernau_132's avatar
SteveVernau_132
Icon for Nimbostratus rankNimbostratus
Nov 15, 2016

String replace in URI when certain node active

Replace component of path when failed over to a certain node.   I have a bit of a tricky situation here.   First I have A priority group (say 10) of two nodes load balancing, and when there are...
application delivery
iRules
LTM
Kai_Wilke's avatar
Kai_Wilke
Icon for MVP rankMVP
Nov 15, 2016

Hi Steve,

you may try the iRule below.

The iRule uses the 

HTTP_REQUEST_SEND
event to perform your required URI mapping right before the request is forwarded to a given pool member (filtered via its IP).

when HTTP_REQUEST_SEND {
    if { [IP::server_addr] equals "10.10.10.10%1" } then {
        clientside {
            HTTP::path [string map { "hello" "goodby" } [HTTP::path]]
        }
    }
}

Note: Instead of using the 

[string map { "hello" "goodby" } [HTTP::path]]
syntax you may also try 
"/goodby[string range [HTTP::path] [string length "/hello"] end]"
. This syntax would be slightly more accurate and also require less CPU ressources.

Cheers, Kai