Get base URL during servlet init()

How can I obtain a Application Server's base URL during a servlet's init(), i.e. not using HttpServletRequest later
e.g. for servlet test accessible at http://localhost:8080/contextroot/test
base URL = "http://localhost:8080/contextroot/"
After some testing the closest I've got is "jndi:/server/contextroot/". Can I get a HTTP URL from this?
public void init(ServletConfig config) throws ServletException {
super.init();
try {
path = config.getServletContext().getResource("/");
} catch (Exception e) {
System.out.println("e: " + e.toString());
Any ideas appreciated. Thanks in advance.
Java EE 5

All what you have in the init() method is the ServletConfig. Have you checked its javadoc to see what it all offers?
[http://java.sun.com/javaee/5/docs/api/javax/servlet/ServletConfig.html]. Hint: check the other getters of ServletContext.

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