Jetty.project: Support a non async ProxyServlet

[gregw]

[gregw]

Some environments cannot support async but need a simple proxy.

[broady]

Any update on this? Is there some reasonable alternative?

[stale[bot]]

This issue has been automatically marked as stale because it has been a full year without activity. It will be closed if no further activity occurs. Thank you for your contributions.

[sbordet]

Won't implement this. Nowadays reactive non-blocking applications seem more common/wanted than fully blocking ones.