Readonlyfbx-fb-connection-type; present wherever igConnectionType is.
Readonlyigx-ig-connection-type; every network names one on both platforms.
Optional Readonlynetworkx-fb-network-properties. Absent where the network has no value —
the emulator-only Ethernet view carries none — so the header is not sent.
Optional ReadonlyradioPigeon telemetry radio_type. Only the Android spellings are known
(WIFI-UNKNOWN / CELLULAR-G4, and OTHER-UNKNOWN on the Ethernet NIC); no iOS upload is decoded, so a
platform without a spelling of its own leaves this undefined and the field is
not sent — never filled with another platform's spelling.
A platform's spelling of the network in the connection headers every request stack and the Pigeon uploads carry.