How does the Fortigate deal with previous XFF headers

[wasfi]

Hi;

I would like to have Fortigate insert an X-Forwarded-For header by using the "Preserve Client IP" option available with a load balancing virtual server. My aim, however, is to replace any X-Forwarded-For header's value that was inserted by a preceding upstream device. How can I achieve this please.


Kindly
Wasfi

[NilaSark · Accepted solution]

found these, might be helpful 
1. https://kb.fortinet.com/kb/documentLink.do?externalID=FD50794
2. https://kb.fortinet.com/kb/documentLink.do?popup=true&externalID=FD41549&languageId=
3.https://kb.fortinet.com/kb/documentLink.do?popup=true&externalID=FD44109&languageId=