According to upstream jetty9 server and client are not affected or more specifically, quote:
"Jetty 9 doesn't even have a UriCompliance, nor is it RFC9110. This PR in Jetty 9 makes no sense. We cannot force RFC9110 on Jetty 9 users, and the Jetty 9 users have no means to configure this UriCompliance rule it once it is implemented." This is more of an issue how browsers and jetty use different conventions to parse a URI. The solution for jetty12 is to deprecate a part of a newer specification which jetty9 does not even use. This can't be properly addressed in Jetty 9. I keep this issue open for further reference
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