         _log = Log.getLogger("mx.rpc.http.HTTPMultiService");
 
         this.baseURL = baseURL;
+
+        concurrency = Concurrency.MULTIPLE;
     }
 
     //--------------------------------------------------------------------------

    *  @playerversion AIR 1.1
    *  @productversion Flex 3
    */
    public var showBusyCursor:Boolean = false;

    //----------------------------------
    //  headers

     *  The default is <code>application/x-www-form-urlencoded</code> which sends requests
     *  like a normal HTTP POST with name-value pairs. <code>application/xml</code> send
     *  requests as XML.
     */
    public var contentType:String = AbstractOperation.CONTENT_TYPE_FORM;

    //----------------------------------
    //  concurrency
    //----------------------------------

    [Inspectable(enumeration="multiple,single,last", defaultValue="multiple", category="General")]
    /**
     * Value that indicates how to handle multiple calls to the same operation within the service.
     * The concurrency setting set here will be used for operations that do not specify concurrecny.
     * Individual operations that have the concurrency setting set directly will ignore the value set here.
     * The default value is <code>multiple</code>. The following values are permitted:
     * <ul>
     * <li><code>multiple</code> Existing requests are not cancelled, and the developer is
     * responsible for ensuring the consistency of returned data by carefully
     * managing the event stream. This is the default value.</li>
     * <li><code>single</code> Only a single request at a time is allowed on the operation;
     * multiple requests generate a fault.</li>
     * <li><code>last</code> Making a request cancels any existing request.</li>
     * </ul>
     *  
     *  @langversion 3.0
     *  @playerversion Flash 9
     *  @playerversion AIR 1.1
     *  @productversion Flex 3
     */
    public function get concurrency():String
    {
        return _concurrency;
    }
    public function set concurrency(c:String):void
    {
        _concurrency = c;
    }

    //----------------------------------
    //  showBusyCursor
    //----------------------------------

    [Inspectable(defaultValue="false", category="General")]
    /**
