Bug 158935 [2.2.0][Smoke]PDF can not preview anything by IE
Details: [2.2.0][Smoke]PDF can not preview anything by IE Step: 1.New a report and add a label 2.Preview as PDF Actual resutl: Can not preview anything Excepted resutl: Preview the label by PDF
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/servlet/ViewerServlet.java
* @param request
	 *            incoming http request
	 * @return
	 */
	protected IContext __getContext( HttpServletRequest request,
			HttpServletResponse response )
	{
		InputOptions options = new InputOptions( );
		options.setOption( InputOptions.OPT_REQUEST, request );
		BirtReportServiceFactory.getReportService( ).setContext(
				getServletContext( ), options );
		return new BirtContext( request, response );
	}
	/**
	 * Local process http request with GET method.
	 * 
	 * @param request
	 *            incoming http request
	 * @param response
	 *            http response
	 * @exception ServletException
	 * @exception IOException
	 * @return
	 */
	protected void __doGet( IContext context ) throws ServletException,
			IOException, BirtException
	{
		IFragment activeFragment = null;
		String servletPath = context.getRequest( ).getServletPath( );
		if ( IBirtConstants.SERVLET_PATH_FRAMESET