The public IPv4 the server echoes in x-fb-client-ip-forwarded: every answer
carries it, because the app asks with x-fb-client-ip: True. The one reader of
that header for both platforms; undefined when the answer carries none or
something that is not an address.
The public IPv4 the server echoes in
x-fb-client-ip-forwarded: every answer carries it, because the app asks withx-fb-client-ip: True. The one reader of that header for both platforms;undefinedwhen the answer carries none or something that is not an address.