今天在做测试，线上环境可以正常发起微信支付。但是切换到沙箱模式，调整到测试用例中约定的支付金额后发起支付，总提示： [代码]HTTP/1.1 200 OK[代码][代码]Server: nginx[代码][代码]Date: Thu, 04 Jul 2019 17:33:40 GMT[代码][代码]Content-Type: text/plain;charset=utf-8[代码][代码]Content-Length: 171[代码][代码]Connection: keep-alive[代码][代码]Keep-Alive: timeout=8[代码][代码]from: sandbox[代码] [代码]<[代码][代码]xml[代码][代码]>[代码][代码]  [代码][代码]<[代码][代码]return_code[代码][代码]>[代码][代码]<![CDATA[FAIL]]>[代码][代码]</[代码][代码]return_code[代码][代码]>[代码][代码]  [代码][代码]<[代码][代码]retmsg[代码][代码]>[代码][代码]<![CDATA[<urlopen error [Errno 111] Connection refused>]]>[代码][代码]</[代码][代码]retmsg[代码][代码]>[代码][代码]  [代码][代码]<[代码][代码]retcode[代码][代码]>[代码][代码]<![CDATA[1]]>[代码][代码]</[代码][代码]retcode[代码][代码]>[代码][代码]</[代码][代码]xml[代码][代码]>[代码]这是个什么情况啊~ 求解啊