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[jetty-users] Jetty 12.0.x blocks server-to-server requests (and in case of 12.0.1 issues warning: WARN :oeju.Blocker:qtp686466458-43: Blocking.Callback incomplete)

This happens on embedded Jetty (ee10 - http/2) HTTPS requests from the embedding application (standard Java HttpServletRequest, URL that contains the global/external host name and the local port number) that is supposed to be handled by the current running process (and thus Jetty server). The local port is necessary because using the default port from localhost will bypass firewall NAT and therefore fail. I have traced this warning to jetty-core/jetty-util/src/main/java/org/eclipse/jetty/util/ but do not understand what is going on there.

The same URL can be evaluated from a command line on the same server without issue, only evaluation from the process itself is blocked.

The same code works on Jetty11. It blocks silently on 12.0.0 but 12.0.1 logs this message to stderr.

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