public void addUnprivilegedServlet(String pathSpec, ServletHolder holder) {
    addServletWithAuth(pathSpec, holder, false);
  }
Adds a servlet in the server that any user can access. This method differs from
{@link #addPrivilegedServlet(String, ServletHolder)} in that any authenticated user can
interact with the servlet added by this method.
@param pathSpec The path spec for the servlet
@param holder   The servlet holder
hbase-http/src/main/java/org/apache/hadoop/hbase/http/HttpServer.java