同样的接口和输入参数，在本地返回这个：（result_code返回Fail，是因为在本地调试，没有配置微信返回网址）

{return_code='SUCCESS', return_msg='OK', result_code='FAIL', err_code='INVALID_REQUEST', err_code_des='订单已全额退款', appid='此处id是正确的，不便展示', mch_id='此处id是正确的，不变展示', device_info='null', nonce_str='此处有数据，隐藏', sign='此处有数据，隐藏', transaction_id='null', out_trade_no='null', out_refund_no='null', refund_id='null', refund_channel='null', refund_fee='null', settlement_refund_fee='null', total_fee='null', settlement_total_fee='null', fee_type='null', cash_fee='null', cash_refund_fee='null', refund_status='null'}

部署服务器后就返回下面这个，调试看了下，发起请求返回的xml就是空的。

{return_code='null', return_msg='null', result_code='null', err_code='null', err_code_des='null', appid='null', mch_id='null', device_info='null', nonce_str='null', sign='null', transaction_id='null', out_trade_no='null', out_refund_no='null', refund_id='null', refund_channel='null', refund_fee='null', settlement_refund_fee='null', total_fee='null', settlement_total_fee='null', fee_type='null', cash_fee='null', cash_refund_fee='null', refund_status='null'}