Oliver Schönrock
Harald Hannelius 
@oschonrock is it used by ubuntu?
Apparently yes... My desktop keeps telling me to "log into the connection" because it can't prove that the internet is working so it thinks it's like a public WiFi connection with a captive portal where you have to give away your email address to get access.
Seems they fixed it. For the record this is what is supposed to happen (ie a 204, with "x-networkmanager-status: online")
$ curl -v http://connectivity-check.ubuntu.com/
* Trying 91.189.91.96:80...
* Connected to connectivity-check.ubuntu.com (91.189.91.96) port 80
> GET / HTTP/1.1
> Host: connectivity-check.ubuntu.com
> User-Agent: curl/8.5.0
> Accept: */*
>
< HTTP/1.1 204 No Content
< x-networkmanager-status: online
Thoughts...
- I can see why they might want to do that.
- It also means someone sniffing the network near their ASN, can determine who is running ubuntu... (public IP leaked)
- using https wouldn't help.. the source IP would still be leaked
- I haven't captured the actual request from "network manager" with wireshark or similar. I wonder what other info is in the request? Especially given it's unencrypted http