code: public WebApplicationContext[] addWebApplications(String host,
                                                        String webapps,
                                                        boolean extract)
          throws IOException
      {
          return addWebApplications(host,webapps,null,extract);
      }
docs: Add Web Applications.
  Add auto webapplications to the server.  The name of the
  webapp directory or war is used as the context name. If the
  webapp matches the rootWebApp it is added as the "/" context.
  @param host Virtual host name or null
  @param webapps Directory file name or URL to look for auto
  webapplication.
  @param extract If true, extract war files
  @exception IOException