为何.net的Webservice产生的wsdl文件里会有两个端口的配置?

该service是给c++程序调用的,访问时需要指定wsdl文件里的端口,但我生成的wsdl里自动生成了两个端口的配置信息

(port name见以下AxionPosServiceSoap,AxionPosServiceSoap12).

<wsdl:service name="AxionPosService">

- <wsdl:port name="AxionPosServiceSoap" binding="tns:AxionPosServiceSoap">

  <soap:address location="http://localhost:1129/AxionPosService.asmx" />

  </wsdl:port>

- <wsdl:port name="AxionPosServiceSoap12" binding="tns:AxionPosServiceSoap12">

  <soap12:address location="http://localhost:1129/AxionPosService.asmx" />

  </wsdl:port>

- <wsdl:port name="AxionPosServiceHttpGet" binding="tns:AxionPosServiceHttpGet">

  <http:address location="http://localhost:1129/AxionPosService.asmx" />

  </wsdl:port>

- <wsdl:port name="AxionPosServiceHttpPost" binding="tns:AxionPosServiceHttpPost">

  <http:address location="http://localhost:1129/AxionPosService.asmx" />

  </wsdl:port>

  </wsdl:service>

 

客户方的工程师说不知道该调用哪一个(由于我也不知道啥原因,只好跟客户说两个都试下^^):

至于原因我在网上找了相关的资料没啥收获,有哪位大侠能帮忙解释下么?