Wed Dec 1 2021 09:15:29 UTC
It's not a bug, it's a feature.
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ID Product Comp Assignee Status Resolution Summary Changed
59758 Tomcat 8 WebSocke dev NEW --- Add http proxy username-password credentials support for ClientEndpoint using system properties 2017-09-13
60597 Tomcat 8 WebSocke dev NEW --- Add ability to set cipher suites for websocket client connections 2021-05-05
2 bugs found.

as

File a new bug in the "WebSocket" component of the "Tomcat 8" product