Bug 156912 Proxy problems with birt-viewer.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/utility/ParameterAccessor.java
String filePath = getParameter( request, PARAM_REPORT );
		filePath = preProcess( filePath );
		filePath = createAbsolutePath( filePath );
		return filePath;
	}
	/**
	 * Get report document name.
	 * 
	 * @param request
	 *            http request
	 * @return report file name
	 * @throws AxisFault
	 */
	public static String getReportDocument( HttpServletRequest request )
	{
		String filePath = getParameter( request, PARAM_REPORT_DOCUMENT );
		filePath = preProcess( filePath );
		if ( filePath == null || filePath.trim( ).length( ) <= 0 )
		{
			filePath = generateDocumentFromReport( request );
			filePath = createDocumentPath( filePath, request );
		}
		else
		{
			filePath = createAbsolutePath( filePath );
		}
		return filePath;
	}
	/**
	 * Create the file path of the the document. The document will be put under