ajax提交 报异常 Request method 'POST' not supported

$(function(){
                // 订单取消
			$("#cancel").click(function() {
				if (confirm("${message("yee.member.order.cancelConfirm")}")) {
					$.ajax({
						url: "${base}/member/order/cancel.jhtml?sn=${order.sn}",
						type: "POST",
						dataType: "json",
						cache: false,
						success: function(message) {
							if (message.type == "success") {
								location.reload(true);
							} else {
								$.message(message);
							}
						}
					});
				}
				return false;
			});
         });

页面提交方法如上，后台以下：

/**
	 * 取消
	 */
	@RequestMapping(value = "/cancel", method = RequestMethod.POST)
	public @ResponseBody
	Message cancel(String sn) {
		Order order = orderService.findBySn(sn);
		if (order == null) {
			return ERROR_MESSAGE;
		}
		Member member = memberService.getCurrent();
		if (!member.equals(order.getMember())) {
			return ERROR_MESSAGE;
		}
		if (order.hasExpired() || (!Order.Status.pendingPayment.equals(order.getStatus()) && !Order.Status.pendingReview.equals(order.getStatus()))) {
			return ERROR_MESSAGE;
		}
		if (orderService.isLocked(order, member, true)) {
			return Message.warn("yee.member.order.locked");
		}
		orderService.cancel(order);
		return SUCCESS_MESSAGE;
	}

前台提交报出：Request method 'POST' not supported。

解决方法：前台去掉type: "POST",后台去掉 method = RequestMethod.POST。