F5 config - X-Forward-Proto (XFP)

f5_xfp.txt

# Recommended solution would be: 
# -	Use Insert header, in the custom HTTP profile that you applied to the virtual servers. 

# For HTTPS Virtuals, insert: X-Forwarded-Proto, with a value of https 
# For HTTP Virtuals, insert: X-Forwarded-Proto, with a value of http 

# Of course you could also use apply an iRule to the Virtual Server, something like this should work: 

when HTTP_REQUEST {
if { [SSL::mode] == 1 } {
    if {!( [HTTP::header "X-Forwarded-Proto"] eq "https") }{
        HTTP::header insert X-Forwarded-Proto "https"
    }
    if { !( [HTTP::header exists "X-Forwarded-Port"]) }{
        HTTP::header insert X-Forwarded-Port [TCP::local_port]
    }
  }
}

Just so you know, this is missing a close-brace for the first if statement at line 10

Good catch @duypm, thanks.