Bug 179636 [Smoke] Chart can not be previewed [0001]
Description: Chart can not be previewed Build number: 2.2.0.v20070328-0630 Steps to reproduce: 1. New a chart, preview. Expected result: Chart is displayed correctly. Actual result: Chart can not be previewed. Error log: N/A
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/utility/ParameterAccessor.java
* URL parameter name to indicate whether cache the parameter.
	 */
	public static final String PARAM_NOCACHE_PARAMETER = "__nocache"; 
	/**
	 * URL parameter name to indicate if open document as attachment(default is
	 * inline ).
	 */
	public static final String PARAM_AS_ATTACHMENT = "__asattachment"; 
	/**
	 * URL parameter name to indicate the execution name.
	 */
	public static final String PARAM_ACTION = "__action"; 
	/**
	 * URL parameter name to indicate the client DPI setting.
	 */
	public static final String PARAM_DPI = "__dpi"; 
	/**
	 * Custom request headers to identify the request is a normal HTTP request
	 * or a soap request by AJAX.
	 */
	public static final String HEADER_REQUEST_TYPE = "request-type"; 
	/**
	 * The request type of "soap".
	 */
	public static final String HEADER_REQUEST_TYPE_SOAP = "soap"; 
	/**
	 * Parameter name that gives the IID of the export data form.
	 */
	public static final String PARAM_IID = "iid"; 
	/**