获取token，参数值错误，直接抛异常，而且异常信息不是json，如何解析code值，代码如下

Map<String, Object> appAccessTokenBody = new HashMap<>();
appAccessTokenBody.put("app_id", Constant.FeiSuOpenAiAppId);
appAccessTokenBody.put("app_secret", Constant.FeiSuOpenAiAppSecret);

    try {
        RawResponse resp = getClient().post(Constant.FeiShuAppAccessToken, appAccessTokenBody, AccessTokenType.Tenant);

        // 处理结果
        System.out.println(resp.getStatusCode());
        System.out.println(Jsons.DEFAULT.toJson(resp.getHeaders()));
        System.out.println(new String(resp.getBody()));
        System.out.println(resp.getRequestID());
    } catch (Exception e) {
        e.printStackTrace();
    }

Start with the getClient().post call and the exception path shown in the issue, then inspect how invalid app_id or app_secret responses are represented by RawResponse. Reproduce the request with invalid credentials and compare the status code, body, headers, and request ID. Done means the SDK's handling of the error code and non-JSON exception response is clearly understood or documented.