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
.equalsIgnoreCase( servletPath ) )
		{
			activeFragment = viewer;
		}
		
		context.getResponse( ).setHeader("Pragma","No-cache");   
		context.getResponse( ).setHeader("Cache-Control","no-cache");  
		context.getResponse( ).setHeader("Cache-Control","no-store"); 
		context.getResponse( ).setDateHeader("Expires", 0);  
		
		activeFragment.service( context.getRequest( ), context.getResponse( ) );
	}
	/**
	 * Locale process http request with POST method. Four different servlet
	 * paths are expected: "/frameset", "/navigation", "/toolbar", and "/run".
	 * 
	 * @param request
	 *            incoming http request
	 * @param response
	 *            http response
	 * @exception ServletException
	 * @exception IOException
	 * @return
	 */
	protected void __doPost( IContext context ) throws ServletException,
			IOException, BirtException
	{
	}
	/**
	 * Local authentication. Alwasy returns true.