java.io.IOException: Server returned HTTP response code: 400 for URL: https://api.mch.weixin.qq.com/secapi/pay/refund
post请求；签名没问题，没有少传任何必填参数，transaction_id和out_trade_no选传1和都传我都试过了，在签名校验工具上也能校验成功；求大神解答。为什么400
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大佬问题解决了吗？同样遇到这个问题无从下手，google，百度了一个遍，没有解决。