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Gilev_Anton_260's avatar
Gilev_Anton_260
Icon for Nimbostratus rankNimbostratus
Aug 17, 2017

Adding/rewriting header in server response.

Hello. Pretty new to F5 and whole iRules and already hit a wall. We need to do a next thing: If a user's request contains a certain header, i need to return content of that header in another header in a server response. All of that got to be done on our F5. I wrote an iRule, but when i enable it, traffic stops completely on that VIP.

 

when HTTP_REQUEST { if { [HTTP::header exists "Header"] } { set $insert_response_header 1 $header_var = HTTP::header value "Header" pool pool_POOL_HLS } else {pool pool_POOL_HLS }

 

} when HTTP_RESPONSE {

 

if {$insert_response_header==1}{

 

HTTP::header replace "CORS" $header_var

 

}

 

}

 

Can somebody point me in a right direction? And the main trouble is that i can't see system logs, since i don't have full access to F5.

 

application delivery
BIG-IP
iRules
  • Jad_Tabbara__J1's avatar
    Jad_Tabbara__J1
    Icon for Cirrostratus rankCirrostratus
    Aug 17, 2017

    Hello Gilev,

    Your code contains error, try the following :

    Also from ssh check the log file in real time using command

    tail -f /var/log/ltm

     

    when HTTP_REQUEST { 

    if { [HTTP::header exists "Header"] } { 

        set insert_response_header 1 
        set header_var [HTTP::header value "Header"]
        log local0. "Header value in request $header_var"
        pool pool_POOL_HLS 

    } else {
        pool pool_POOL_HLS 
    }

} 

when HTTP_RESPONSE {

    if { $insert_response_header eq "1" } {            
        HTTP::header replace "CORS" $header_var
        log local0. "Header CORS value [HTTP::header value "CORS"]"
    } 
}

     

    Hope it helps

    Don't forget to give us feedback

    Regards