use ip_address6 if available
Client should add ip6 address if available in eip-service:
"host": "gateway2.float.bitmask.net",
"ip_address": "204.13.164.252",
"ip_address6": "2620:13:4000:4000:8080::252",
"location": "Seattle"
Client should add ip6 address if available in eip-service:
"host": "gateway2.float.bitmask.net",
"ip_address": "204.13.164.252",
"ip_address6": "2620:13:4000:4000:8080::252",
"location": "Seattle"