Heartbeat always gets touched even with no active connections when connected from iPad Safari

[nullpo-head]

The same problem as #1795 is still happening with 3.5.0 only in Safari on iPad.
Even after closing all tabs or even browser, it seems Code-Server recognizes 1 active connection. Because of that, Heartbeat keeps getting touched.

2020-09-04T15:01:35.219Z] trace 2 active connections
[2020-09-04T15:01:35.220Z] trace heartbeat
[2020-09-04T15:02:35.220Z] trace 1 active connection
[2020-09-04T15:02:35.221Z] trace heartbeat
[2020-09-04T15:03:35.221Z] trace 1 active connection
[2020-09-04T15:03:35.221Z] trace heartbeat

I’ve confirmed that this phenomenon doesn’t happen in Chrome on Windows/macOS, nor Safari on macOS. It seems to happen only in Safari on iPad OS.
FYI, this is the log when I connect to a Code-Server instance by desktop browsers.

[2020-09-04T14:56:03.729Z] trace 2 active connections
[2020-09-04T14:56:03.729Z] trace heartbeat
[server] disconnected from client {"proxies":3}
[2020-09-04T14:57:03.731Z] trace 0 active connections
[2020-09-04T14:57:49.490Z] trace heartbeat

BTW, I’ve noticed this problem while I’m testing Out-of-the-Box-CodeServer, which is an easy setup tool of Code-Server. So, you can reproduce the environment by the tool if you need.

• Web Browser: Safari
• Local OS: iPad OS 13.6
• Remote OS: Ubuntu 20.04
• Remote Architecture: amd64
• code-server --version: 3.5.0 de41646

[nhooyr]

Bizarre! What does sudo ss -tpn output?

In #2112 @OliverwengFiltered was able to reproduce with chrome on macOS.

[ifduyue]

I think this is the same problem described in #2112

[stale]

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