[jetty-users] Jetty 12.0.x blocks server-to-server requests (and in case

[Silvio Bierman <sbierman@xxxxxxxxxxxxxxxxxx>]

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/Blocker.java 
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.