This website provides a simple HTTP endpoint for ConnMan connectivity checks.
ConnMan is a Linux connection manager used by some Linux and embedded systems to verify whether a network connection has Internet access.
The online check endpoint is:
http://connman-onlinecheck.net/online/status.html
A successful request returns HTTP 200 and the ConnMan status header.
HTTP/1.1 200 OK X-ConnMan-Status: online Cache-Control: no-store online
[General] EnableOnlineCheck=true OnlineCheckMode=one-shot OnlineCheckIPv4URL=http://connman-onlinecheck.net/online/status.html OnlineCheckIPv6URL=http://connman-onlinecheck.net/online/status.html OnlineCheckConnectTimeout=5