 basics example</a> -
                shows basic steps required to trace request inside your app;
            </li>
            <li>
                <a href="#code/src/main/scala/sample/TraceHierarchy.scala" class="shortcut">Trace hierarchy example</a> -
                shows how to trace call hierarchies;
            </li>
            <li>
                <a href="#code/src/main/scala/sample/SprayDirectives.scala" class="shortcut">Spray integration example</a> -
                shows spray directives whic