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Forum Discussion

networkdawg_303's avatar
networkdawg_303
Icon for Nimbostratus rankNimbostratus
Dec 14, 2016

iRules - Remove WWW AND replace "Host"

Hello,   I am sorry if this is very easy to do, but I am really new to F5 and iRules.   We have an iRule in place which replaces the domain part of a URL. This rule is below.   The situation...
application delivery
BIG-IP
iRules
Kai_Wilke's avatar
Kai_Wilke
Icon for MVP rankMVP
Dec 15, 2016

Hi networkdawg,

you may try the iRule below.

It uses the 

[domain]
command to extract the first three dotted domain elements (e.g. four.third.second.frist) from the requested HOST-header, then passes the information to a
[getfield]
command to extract the third element and adds the new second and first dotted domain elements via TCL concentation... 

when HTTP_REQUEST { 
    if { [string tolower [HTTP::host]] ends_with ".domain1.com" } then { 
        HTTP::host "[getfield [domain [HTTP::host] 3] "." 1].primarydomain.com"  
    } 
}

Cheers, Kai