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Forum Discussion

Antonio_Varni's avatar
Antonio_Varni
Icon for Nimbostratus rankNimbostratus
Jan 21, 2008

replace all instances of a HTTP header

How can I replace all instances of a given header?   Specifically in my case I am trying to remove all previously set X-Forwarded-For headers before having the LTM inject it's own. The X-Forwarded...
application delivery
dev
devops
iRules
TD_DSS_116260's avatar
TD_DSS_116260
Icon for Nimbostratus rankNimbostratus
Nov 25, 2013

I use the below rule and successfully end up with our clients IP address. This will check for any pre-existing XFF, remove it, and then add the IP of the incoming request. It's a bit wasteful (why not just wipe out the XFF regardless of if it is there or not?) though.

    when HTTP_REQUEST {
    if {[HTTP::header exists X-Forwarded-For]}
    {
    HTTP::header remove X-Forwarded-For
    HTTP::header insert X-Forwarded-For [IP::remote_addr]
    } else {  
    HTTP::header insert X-Forwarded-For [IP::remote_addr]
    }}