一些 generate_204 #URL
● http://www.gstatic.com/generate_204
● http://connectivitycheck.gstatic.com/generate_204
● http://edge.microsoft.com/captiveportal/generate_204
● http://cp.cloudflare.com/generate_204
● http://www.qualcomm.cn/generate_204
● http://connect.rom.miui.com/generate_204
● http://connectivitycheck.platform.hicloud.com/generate_204
● http://wifi.vivo.com.cn/generate_204
● http://www.gstatic.com/generate_204
● http://connectivitycheck.gstatic.com/generate_204
● http://edge.microsoft.com/captiveportal/generate_204
● http://cp.cloudflare.com/generate_204
● http://www.qualcomm.cn/generate_204
● http://connect.rom.miui.com/generate_204
● http://connectivitycheck.platform.hicloud.com/generate_204
● http://wifi.vivo.com.cn/generate_204