SUDS 丢失 SOAP 消息体部分

Question

我正在发送一个SOAP请求来更新某个实体。当我创建（而不是更新）几乎相同的东西时，一切都正常。我追踪了客户端和传输的日志，最后找到了线索。看起来是这样的：

DEBUG:suds.client:sending to (https://webservices.autotask.net/ATServices/1.5/atws.asmx)
message:
<?xml version="1.0" encoding="UTF-8"?>
<SOAP-ENV:Envelope xmlns:ns0="http://autotask.net/ATWS/v1_5/" xmlns:ns1="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
<SOAP-ENV:Header/>
<ns1:Body>
  <ns0:update>
    <ns0:Entities xmlns:xsd="http://www.w3.org/2001/XMLSchema">
      <ns0:Entity xsi:type="ns0:Ticket">
        <ns0:id>123</ns0:id>
        <ns0:UserDefinedFields xsi:type="xsd:string"></ns0:UserDefinedFields>
        <ns0:AccountID xsi:type="xsd:string">123</ns0:AccountID>
        <ns0:AllocationCodeID xsi:type="xsd:string">123</ns0:AllocationCodeID>
        <ns0:CompletedDate xsi:type="xsd:string">2011-04-04 14:47:02</ns0:CompletedDate>
        <ns0:CreateDate xsi:type="xsd:string">2011-04-04 04:08:02.000203</ns0:CreateDate>
        <ns0:CreatorResourceID xsi:type="xsd:string">123</ns0:CreatorResourceID>
        <ns0:Description xsi:type="xsd:string"></ns0:Description>
        <ns0:DueDateTime xsi:type="xsd:string">2011-04-05 09:36:00</ns0:DueDateTime>
        <ns0:EstimatedHours xsi:type="xsd:string">0.0</ns0:EstimatedHours>
        <ns0:IssueType xsi:type="xsd:string">123</ns0:IssueType>
        <ns0:LastActivityDate xsi:type="xsd:string">2011-04-04 14:47:04.000157</ns0:LastActivityDate>
        <ns0:Priority xsi:type="xsd:string">123</ns0:Priority>
        <ns0:QueueID xsi:type="xsd:string">123</ns0:QueueID>
        <ns0:Status xsi:type="xsd:string">123</ns0:Status>
        <ns0:SubIssueType xsi:type="xsd:string">123</ns0:SubIssueType>
        <ns0:TicketNumber xsi:type="xsd:string">123</ns0:TicketNumber>
        <ns0:Title xsi:type="xsd:string">foo</ns0:Title>
        <ns0:FirstResponseDateTime xsi:type="xsd:string">2011-04-04 14:47:02.000427</ns0:FirstResponseDateTime>
        <ns0:ResolutionPlanDateTime xsi:type="xsd:string">2011-04-04 14:47:02.000427</ns0:ResolutionPlanDateTime>
        <ns0:ResolvedDateTime xsi:type="xsd:string">2011-04-04 14:47:02.000427</ns0:ResolvedDateTime>
        <ns0:Resolution xsi:type="xsd:string"></ns0:Resolution>
    </ns0:Entity>
  </ns0:Entities>
</ns0:update>
</ns1:Body>
</SOAP-ENV:Envelope>
DEBUG:suds.client:headers = {'SOAPAction': u'"http://autotask.net/ATWS/v1_5/update"';, 'Content-Type': 'text/xml; charset=utf-8'}
DEBUG:suds.transport.http:sending:
URL:https://webservices.autotask.net/ATServices/1.5/atws.asmx
HEADERS: {'Soapaction': u'"http://autotask.net/ATWS/v1_5/update"', 'SOAPAction': u'"http://autotask.net/ATWS/v1_5/update"', 'Content-Type': 'text/xml; charset=utf-8', 'Content-type': 'text/xml; charset=utf-8', 'Authorization': 'Basic YXV0b21hdGlhQGFyY2VzLm5ldDp5dWYkOWFyN2VQaDY='}
MESSAGE:
<?xml version="1.0" encoding="UTF-8"?>
<SOAP-ENV:Envelope xmlns:ns0="http://autotask.net/ATWS/v1_5/" xmlns:ns1="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
<SOAP-ENV:Header/>
<ns1:Body>
  <ns0:update>
    <Entities/>
  </ns0:update>
</ns1:Body>
</SOAP-ENV:Envelope>

但是这样我就收到了一个错误：

Object reference not set to an instance of an object.

有没有人知道，这个SOAP请求发生了什么，为什么它的整个实体内容都丢失了，变成了一个空消息？这是suds的问题，服务器的问题，代码的问题，还是我自己的问题？

感谢任何小帮助，让我理解发生了什么。

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SUDS 丢失 SOAP 消息体部分

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