Support for Asynchronous Requests
Enable an 'async-supported' servlet property if you work with Servlet3 API containers and need to support asynchronous requests:
<servlet>
<servlet-name>CXFServlet</servlet-name>
<display-name>CXF Servlet</display-name>
<servlet-class>
org.apache.cxf.transport.servlet.CXFServlet
</servlet-class>
<!-- Enable asynchronous requests -->
<async-supported>true</async-supported>
<load-on-startup>1</load-on-startup>
</servlet>