Bug 166001 The webpage can't be found in WebView, if "WebViewer.startup( null );" is not called.
Now I'm using a SVG viewer to preview report in designer, it need not a HTTP server. So I removed "WebViewer.startup( null );" from designer's initial process, but I found those "web view as ..." all can not open a web page.
viewer/org.eclipse.birt.report.viewer/src/org/eclipse/birt/report/viewer/utilities/WebappAccessor.java
{
		try
		{
			return AppServerWrapper.getInstance( ).getAppServer( ).getHost( );
		} catch ( CoreException e )
		{
			return null;
		}
	}
	/**
	 * Get path of web applcation.
	 * 
	 * @param pluginId
	 *            Embedded web application id
	 * @param path
	 *            webapp path relative to the plugin directory
	 * @return String absolute webapp path
	 * @exception CoreException
	 */
	private static IPath getWebappPath( String pluginId, IPath path )
			throws CoreException
	{
		Bundle bundle = Platform.getBundle( pluginId );
		if ( bundle == null )
		{
			throw new CoreException( new Status( IStatus.ERROR,
					ViewerPlugin.PLUGIN_ID, IStatus.OK, ViewerPlugin
							.getFormattedResourceString(
									"viewer.appserver.cannotfindplugin", 
									new Object[] { pluginId } ), null ) );