Bug 156912 Proxy problems with birt-viewer.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/utility/ParameterAccessor.java
public static final String PARAM_SHOW_TITLE = "__showtitle"; 
	/**
	 * URL parameter name that specifies whether show the toolbar.
	 */
	public static final String PARAM_TOOLBAR = "__toolbar"; 
	
	/**
	 * URL parameter name that specifies whether show the navigationbar.
	 */
	public static final String PARAM_NAVIGATIONBAR = "__navigationbar"; 
	/**
	 * URL parameter name that specifies whether force prompting the parameter dialog.
	 */
	public static final String PARAM_PARAMETER_PROMPTING = "__parameterprompting"; 
	
	/**
	 * URL parameter name that gives the report design name.
	 */
	public static final String PARAM_REPORT = "__report"; 
	/**
	 * URL parameter name that gives the report document name.
	 */
	public static final String PARAM_REPORT_DOCUMENT = "__document"; 
	/**
	 * URL parameter name that gives the format to display the report, html or
	 * pdf.
	 */
	public static final String PARAM_FORMAT = "__format"; 
	/**
	 * Format parameter constants to display the report in html.