Initiate the request.
@param {Array} body an array of byte values to send.
function (body) {
        var me = this;
        me.body = body;
        if (!Ext.data.flash.BinaryXhr.flashPluginActive) {
            Ext.globalEvents.addListener("flashready", me.onFlashReady, me);
        } else {
            this.onFlashReady();
        }
    }