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sunnyman67_1367's avatar
sunnyman67_1367
Icon for Nimbostratus rankNimbostratus
Nov 03, 2013

URL rewrite through iRule

Hi Guys, i have one "Performance (HTTP)" virtual server on F5-1600 series, and i want to change the URL "http://www.abc.com" to "http://partner.abc.com/xyz". i have tried all below scripts :   1- ...
application delivery
availability
BIG-IP Access Policy Manager (APM)
devops
iRules
management
performance
security
  • IheartF5_45022's avatar
    IheartF5_45022
    Nov 11, 2013

    Hi Sunnyman,

    This will work;

    if { [IP::addr [IP::client_addr] equals 1.1.1.1] || [IP::addr [IP::client_addr] equals 1.1.1.2} { 
    SNAT with 1.1.1.100
    snatpool VM_SNAT_POOL_1_1_1_100
} elseif { [IP::addr [IP::client_addr] equals 1.1.1.11] || [IP::addr [IP::client_addr] equals 1.1.1.12} { 
    SNAT with 1.1.1.100
    snatpool VM_SNAT_POOL_1_1_1_200
}

    But that's not a very scalable way of doing it if your list is going to grow. If it's going to grow then use an address datagroup, with values snatpool names, which you can use like this

    snatpool [class match -value [IP::remote_addr] equals dg_sunnyman_snatpools]

    or more correctly;

    set snatpool [class match -value [IP::remote_addr] equals dg_sunnyman_snatpools]
if {$snatpool ne "") {
    snatpool $snatpool
 }
IheartF5_45022's avatar
IheartF5_45022
Icon for Nacreous rankNacreous
Nov 05, 2013

So do you really need to change the Host header at all? It has no effect on where the F5 sends the traffic BTW.

when HTTP_REQUEST {
    if {[string tolower [HTTP::host]] starts_with "abc.com" && [string tolower[HTTP::path]] eq "/ukm"} {
         This pool needs to be created with pool member 1.1.1.1:8080
        pool pl_sunnyman_8080
        HTTP::uri "/xyz"
    }
}
when LB_SELECTED {
     This will update the Host header with the IP:port of the selected server
    HTTP::header replace Host "[LB::server addr]:[LB::server port]"
}

This way when you want to add more servers into your pool, the Host header will get rewritten with whatever server got chosen from the pool, but as I said, unless you have a particular reason to rewrite the Host header I wouldn't bother - it has no effect on routing.