wdisp/add_xforwardedfor_header is a SAP Parameter attribute which is used to control Include IPaddress in headerfield x-forwarded-for information. This is available within R/3 SAP systems depending on the version and release level.
Below is the standard documentation available and a few details of the attributes values .
The parameter determines whether the SAP Web Dispatcher includes the IP
address of the client in the header field x-forwarded-for. If it does,
the application on the application server can read the route that the
request has taken. If the parameter has the value false, the Web
Dispatcher leaves the header field unchanged.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.