We found the change introduced by  ticket cause Fuse/Integration product test failure. More specifically, the new added

+        requestImpl.setAttribute(ASYNC_MAPPING, requestImpl.getHttpServletMapping());

will call into io.undertow.servlet.spec.HttpServletRequestImpl line 241, the match is null, hence NPE thrown. We can hit this NPE when io.undertow.servlet.spec.AsyncContextImpl is used

appended a reproducer project(rest-ssl-test.zip) crafted by fmariani@redhat.com to expose this issue. Just run "mvn clean verify" you can see the NPE.