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    Below is the error I get with HTTP code 500 when I sent a request
    from a client to REST-API that was left open and the server was
    restarted.<br>
    <br>
    Evidently the session is expired, but why do we return HTTP 500? Is
    this a server internal error?<br>
    IMHO one of 400 codes is more appropriate for that error. E.g. 401
    (Unauthorized) or 440 (Login Timeout according to
    <a class="moz-txt-link-freetext" href="http://en.wikipedia.org/wiki/List_of_HTTP_status_codes">http://en.wikipedia.org/wiki/List_of_HTTP_status_codes</a>).<br>
    <p><b>type</b> Exception report</p>
    <p><b>message</b> </p>
    <p><b>description</b> <u>The server encountered an internal error
        () that prevented it from fulfilling this request.</u></p>
    <p><b>exception</b> </p>
    org.jboss.resteasy.spi.UnhandledException:
    java.lang.IllegalStateException: setAttribute: Session already
    invalidated
    org.jboss.resteasy.core.SynchronousDispatcher.handleException(SynchronousDispatcher.java:245)

    org.jboss.resteasy.core.SynchronousDispatcher.handleInvokerException(SynchronousDispatcher.java:190)

    org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:540)

    org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:502)

    org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:119)

    org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:208)

    org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:55)

    org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:50)

    javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
org.ovirt.engine.core.authentication.AuthenticationFilter.doFilter(AuthenticationFilter.java:80)
    <p><b>root cause</b> </p>
    java.lang.IllegalStateException: setAttribute: Session already
    invalidated
    org.apache.catalina.session.StandardSession.setAttribute(StandardSession.java:1289)

    org.apache.catalina.session.StandardSession.setAttribute(StandardSession.java:1254)

    org.apache.catalina.session.StandardSessionFacade.setAttribute(StandardSessionFacade.java:130)

    org.ovirt.engine.api.common.security.auth.SessionUtils.setEngineSessionId(SessionUtils.java:74)

    org.ovirt.engine.api.common.security.auth.Challenger.executeBasicAuthentication(Challenger.java:194)

    org.ovirt.engine.api.common.security.auth.Challenger.preProcess(Challenger.java:116)

    org.jboss.resteasy.core.ResourceMethod.invokeOnTarget(ResourceMethod.java:247)

org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:222)
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