structuredAttrs is enabled

trying https://repo1.maven.org/maven2/org/eclipse/jetty/ee9/websocket/jetty-ee9-websocket-jetty-api/12.1.0/jetty-ee9-websocket-jetty-api-12.1.0.jar
  % Total    % Received % Xferd  Average Speed  Time    Time    Time   Current
                                 Dload  Upload  Total   Spent   Left   Speed

  0      0   0      0   0      0      0      0                              0
100  32301 100  32301   0      0 220.5k      0                              0
100  32301 100  32301   0      0 220.4k      0                              0
100  32301 100  32301   0      0 220.3k      0                              0