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
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