zookeeper-server/src/main/java/org/apache/zookeeper/server/admin/JettyAdminServer.java [357:370]:
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    private void constrainTraceMethod(ServletContextHandler ctxHandler) {
        Constraint c = new Constraint();
        c.setAuthenticate(true);

        ConstraintMapping cmt = new ConstraintMapping();
        cmt.setConstraint(c);
        cmt.setMethod("TRACE");
        cmt.setPathSpec("/*");

        ConstraintSecurityHandler securityHandler = new ConstraintSecurityHandler();
        securityHandler.setConstraintMappings(new ConstraintMapping[] {cmt});

        ctxHandler.setSecurityHandler(securityHandler);
    }
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zookeeper-metrics-providers/zookeeper-prometheus-metrics/src/main/java/org/apache/zookeeper/metrics/prometheus/PrometheusMetricsProvider.java [342:355]:
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    private void constrainTraceMethod(ServletContextHandler ctxHandler) {
        Constraint c = new Constraint();
        c.setAuthenticate(true);

        ConstraintMapping cmt = new ConstraintMapping();
        cmt.setConstraint(c);
        cmt.setMethod("TRACE");
        cmt.setPathSpec("/*");

        ConstraintSecurityHandler securityHandler = new ConstraintSecurityHandler();
        securityHandler.setConstraintMappings(new ConstraintMapping[] {cmt});

        ctxHandler.setSecurityHandler(securityHandler);
    }
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