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/WebViewer.java
{
	/**
	 * HTML format name
	 */
	final public static String HTML = "html"; 
	/**
	 * PDF format name
	 */
	final public static String PDF = "pdf"; 
	/**
	 * DOC format name
	 */
	final public static String DOC = "doc";
	/**
	 * Birt web viewer plugin id
	 */
	final public static String WebAppPlugin = ViewerPlugin.PLUGIN_ID;
	/**
	 * locale preference name
	 */
	final public static String USER_LOCALE = "user_locale"; 
	/**
	 * Preference key for SVG chart flag.
	 */
	final public static String SVG_FLAG = "svg_flag"; 
	/**
	 * Preference key for master page content flag.
	 */