Just tried on MacOS 10.11.6: the StartupItem works now correctly.
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Many Thanks !
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Always a message when launching the app saying the console is not running on port 9999, but the console works ...
Hello from France.
Excuse my bad english ;-)
On MacOS El Capitan, the "startup item" of Abyss Web Server is correctly installed in Library/StartupItemps, but server doesn't launches at reb ...