private Configuration getConfFromContext() {
    Configuration conf =
      (Configuration) getServletContext().getAttribute(HttpServer.CONF_CONTEXT_ATTRIBUTE);
    assert conf != null;
    return conf;
  }
Return the Configuration of the daemon hosting this servlet. This is populated when the
HttpServer starts.
hbase-http/src/main/java/org/apache/hadoop/hbase/http/conf/ConfServlet.java