network captive detect URL

curl --resolv play.googleapis.com:80:127.0.0.1  http://play.googleapis.com/generate_204

curl --resolv www.msftconnecttest.com:80:127.0.0.1  http://www.msftconnecttest.com/connecttest.txt

curl --resolv ipv6.msftconnecttest.com:80:127.0.0.1  http://ipv6.msftconnecttest.com/connecttest.txt

wget -4 https://connectivitycheck.gstatic.com/generate_204

wget -4 https://www.google.com/gen_204

wget -4 http://connectivitycheck.gstatic.com/generate_204

wget -4 http://www.google.com/gen_204

wget -6 https://connectivitycheck.gstatic.com/generate_204

wget -6 https://www.google.com/gen_204

wget -6 http://connectivitycheck.gstatic.com/generate_204

wget -6 http://www.google.com/gen_204

wget http://ipv6.google.com/gen_204

wget https://ipv6.google.com/gen_204