Forum Discussion

BaltoStar_12467's avatar
BaltoStar_12467
Aug 05, 2015

BIG-IP : HTTP Profile Insert X-Forwarded-For Enabled but not found in request headers collection

F5 BIG-IP Virtual Edition v11.4.1 (Build 635.0) LTM on ESXi

For a 

Virtual-Server
assigned an 
HTTP Profile
configured with : 

Insert X-Forwarded-For Enabled

under what circumstances would the header not be inserted ?

My iRule logs :

when HTTP_REQUEST {
    log local0. "X-Forwarded-For header = [HTTP::header X-Forwarded-For]"
`


indicate header is not present -- here is log output : 


`X-Forwarded-For header =

Could disabling 

HTTP_REQUEST
event at end of iRule affect 
HTTP Profile
ability to add the header ?

application delivery
design
header insert
http profile
LTM
x-forwarded-for
  • giltjr's avatar
    giltjr
    Icon for Nimbostratus rankNimbostratus
    Aug 05, 2015

    I'm not 100% sure, but since the F5 is inserting the header to send to the server I would not expect it to be there when HTTP_REQUEST is being processed. HTTP_REQUEST should have what is being sent by the client and unless the client is sending that header it should not be there.

     

  • Kevin_Stewart's avatar
    Kevin_Stewart
    Icon for Employee rankEmployee
    Aug 05, 2015

    It is present in 11.6. What version are you running? Try this:

    when HTTP_REQUEST {
    foreach x [HTTP::header names] {
        log local0. "$x = [HTTP::header $x]"
    }
}

    Do you see the XFF header in the log?