web.xml

<?xml version="1.0"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
         version="3.0"
         metadata-complete="true">

    <!-- In order to speed up web application startup, we've disabled scanning of WEB-INF/lib jars for Servlet 3.0
    specific annotations. If you wish to use these annotations, remove the 'metadata-complete' attribute. -->

    <listener>
        <listener-class>spray.servlet.Initializer</listener-class>
    </listener>

    <servlet>
        <servlet-name>SprayConnectorServlet</servlet-name>
        <servlet-class>spray.servlet.Servlet30ConnectorServlet</servlet-class>
        <async-supported>true</async-supported>
    </servlet>

    <servlet-mapping>
        <servlet-name>SprayConnectorServlet</servlet-name>
        <url-pattern>/*</url-pattern>
    </servlet-mapping>

</web-app>