      *  Returns a string representation of the message.
      *
      *  @return String representation of the message.
+     *  
+     *  @langversion 3.0
+     *  @playerversion Flash 9
+     *  @playerversion AIR 1.1
+     *  @productversion BlazeDS 4
+     *  @productversion LCDS 3 
      */
     public function toString():String
     {

     *  Messages sent by a MessageAgent can have a priority header with a 0-9
     *  numerical value (0 being lowest) and the server can choose to use this
     *  numerical value to prioritize messages to clients. 
     */
    public static const PRIORITY_HEADER:String = "DSPriority";

	/**
     *  Messages that need to set remote credentials for a destination
     *  carry the Base64 encoded credentials in this header.  
	 */
	public static const REMOTE_CREDENTIALS_HEADER:String = "DSRemoteCredentials";


     *  A status code can provide context about the nature of a response
     *  message. For example, messages received from an HTTP based channel may
     *  need to report the HTTP response status code (if available).
     *  
     *  @langversion 3.0
     *  @playerversion Flash 9
     *  @playerversion AIR 1.1
     *  @productversion BlazeDS 4
     *  @productversion LCDS 3 
     */
    public static const STATUS_CODE_HEADER:String = "DSStatusCode";

