Forum Discussion

Yann_Desmarest's avatar
Yann_Desmarest
Icon for Cirrus rankCirrus
Mar 24, 2016

Hello,

You can use the following : 

when HTTP_REQUEST {
  if {[HTTP::header exists X-Forwarded-For]}{
      HTTP::header replace X-Forwarded-For "[HTTP::header X-Forwarded-For], [IP::client_addr]"
  } else {  
      HTTP::header insert X-Forwarded-For [IP::client_addr]
  }
}
  • MSK_222682's avatar
    MSK_222682
    Icon for Nimbostratus rankNimbostratus
    Mar 24, 2016
    Hi Yann, Thanks for the quick response. Will this iRule insert X-Forwarded-For header for the client requests which already have it ?? Looking at the script my understanding is it would check if X-Forwarded-For header exists but cannot understand the replace and insert statements of the script. Can you please shed some light on it. -MSK
  • Yann_Desmarest's avatar
    Yann_Desmarest
    Icon for Cirrus rankCirrus
    Mar 24, 2016
    Hello, The irule provided add the client ip to an existing X- header otherwise, it will add a new one with the clientip. Insert allow you to add a new header. Replace add a new header if there is no existing header with the same name, otherwise it changes the value of an existing x- header