Bug 156912 Proxy problems with birt-viewer.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/utility/ParameterAccessor.java
/**
	 * Resource path set in the web application.
	 */
	public static String birtResourceFolder = null;
	/**
	 * Flag indicating that if initialize the context.
	 */
	protected static boolean isInitContext = false;
	/**
	 * Overwrite flag
	 */
	public static boolean isOverWrite;
	/**
	 * Application Context Attribute Name
	 */
	public static final String ATTR_APPCONTEXT_KEY = "AppContextKey"; 
	/**
	 * Application Context Attribute value
	 */
	public static final String ATTR_APPCONTEXT_VALUE = "AppContextValue"; 
	/**
	 * Get bookmark. If page exists, ignore bookmark.
	 * 
	 * @param request
	 * @return the bookemark
	 */
	public static String getBookmark( HttpServletRequest request )
	{
		int page = getParameterAsInt( request, PARAM_PAGE );
		return page < 1