1) Windows
http://www.msftconnecttest.com/connecttest.txt
2) Apple
http://captive.apple.com/hotspot-detect.html
3) Android
http://connectivitycheck.gstatic.com/generate_204
1) Windows
http://www.msftconnecttest.com/connecttest.txt
2) Apple
http://captive.apple.com/hotspot-detect.html
3) Android
http://connectivitycheck.gstatic.com/generate_204