android - Get IPv4 address of client -


i have android app makes simple rest call backend server (google app engine [gae]). on gae, trying extract ipv4 address of connection , ipv6 address.

i'm using extract ipaddress. in addition, have checked functions clientinfo return either null or ipv6 address.

any suggestions?

ip = headers.getfirstvalue("x-forwarded-for");   if (ip == null || ip.equals("")) {       clientinfo clientinfo = request.getclientinfo();     ip = clientinfo.getaddress(); } else {     clientinfo clientinfo = request.getclientinfo();     log.info("x-forwarded-for ip:"+ip+" other ip:"+clientinfo.getaddress()); }

a connection either ipv4 or ipv6. if connection comes in on ipv6 there no ipv4 address know. if connection front end load balancers gae instance ipv6 that's , you'll have deal it.

these days can no longer assume there ipv4. parts of internet ipv6-only. facebook data centres first large scale example google big ipv6 supporter wouldn't surprised see similar there.


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