几经查找原因原来只需要把：
<?xml version="1.0" encoding="utf-8"?>中的 http://www.w3.org/2003/05/soap-envelope 改成： http://schemas.xmlsoap.org/soap/envelope/即可 标签：http,错误,错误代码,envelope,soap,org,SOAP From： https://www.cnblogs.com/daboluo/p/17143822.html
<soap12:Envelope xmlns:xsi=" http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd=" http://www.w3.org/2001/XMLSchema" xmlns:soap12=" http://www.w3.org/2003/05/soap-envelope">
<soap12:Body>
<taskFeedback xmlns=" http://www.hainanjt.gov.cn/soa_service/">
<taskFeedbackRequest>
<APIPassword>123</APIPassword>
<MessageID>123</MessageID>
<APIDevUserID>123</APIDevUserID>
<Version>123</Version>
<APISellerUserID>123</APISellerUserID>
<TrackCode>123</TrackCode>
</taskFeedbackRequest>
</taskFeedback>
</soap12:Body>
</soap12:Envelope>