无法使用SOAPpy调用webservice方法

Question

我正在尝试使用SOAPpy来调用一个网络服务：

from SOAPpy import SOAPProxy

url = 'http://www.webservicex.net/WeatherForecast.asmx'

server = SOAPProxy(url);
print server.GetWeatherByPlaceName('Dallas');
print server.GetWeatherByZipCode ('33126');

但是服务器调用失败了：

Traceback (most recent call last):
  File "soap_test.py", line 6, in <module>
    print server.GetWeatherByPlaceName('Dallas');
  File "C:\usr\bin\Python26\lib\site-packages\SOAPpy\Client.py", line 451, in __call__
    return self.__r_call(*args, **kw)
  File "C:\usr\bin\Python26\lib\site-packages\SOAPpy\Client.py", line 473, in __r_call
    self.__hd, self.__ma)
  File "C:\usr\bin\Python26\lib\site-packages\SOAPpy\Client.py", line 387, in __call
    raise p
SOAPpy.Types.faultType: <Fault soap:Client: System.Web.Services.Protocols.SoapException: Server did not recognize the value of HTTP Header SOAPAction: GetWeatherByPlaceName.
   at System.Web.Services.Protocols.Soap11ServerProtocolHelper.RouteRequest()
   at System.Web.Services.Protocols.SoapServerProtocol.RouteRequest(SoapServerMessage message)
   at System.Web.Services.Protocols.SoapServerProtocol.Initialize()
   at System.Web.Services.Protocols.ServerProtocol.SetContext(Type type, HttpContext context, HttpRequest request, HttpResponse response)
   at System.Web.Services.Protocols.ServerProtocolFactory.Create(Type type, HttpContext context, HttpRequest request, HttpResponse response, Boolean& abortProcessing): >

我哪里做错了呢？

Answer 1

在使用 .NET 的网络服务时，你可以在调用时添加一个 soap 动作的覆盖。这就像下面这样。这段代码已经确认可以正常工作。

import SOAPpy

ns = 'http://www.webservicex.net'
url = '%s/WeatherForecast.asmx' % ns

server = SOAPpy.SOAPProxy( url, namespace=ns )
#following is required for .NET
server.config.buildWithNamespacePrefix = 0
#adding the soapaction is required for .NET
print server._sa( '%s/GetWeatherByPlaceName' %ns ).GetWeatherByPlaceName( PlaceName='Dallas' )
print server._sa( '%s/GetWeatherByZipCode' %ns ).GetWeatherByZipCode( ZipCode='33126' )

有人写了一个 类 来做类似的事情。

这是上面那个包装器的修改版，专门为 .NET 设计：

import SOAPpy

class SOAPProxy( SOAPpy.SOAPProxy ):
    """Wrapper class for SOAPpy.SOAPProxy

    Designed so it will prepend the namespace to the action in the
    SOAPAction HTTP headers.
    """

    def __call( self, name, args, kw, ns=None, sa=None, hd=None, ma=None ):
        sa = sa or self.soapaction
        ns = ns or self.namespace
        self.config.buildWithNamespacePrefix = 0

        # Only prepend namespace if no soapaction was given.
        if ns and not sa:
            if ns.endswith( '/' ):
                sa = '%s%s' % ( ns , name )
            else:
                sa = '%s/%s' % ( ns , name )

        #fixup boolean args - .net wants lowercase
        for arg in kw:
            if isinstance( kw[ arg ], types.BooleanType ):
                kw[ arg ] =  SOAPpy.Types.booleanType( kw[ arg ] )


        return SOAPpy.SOAPProxy.__call( self, name, args, kw, ns, sa, hd, ma )

if __name__ == '__main__':
    print __doc__

Answer 2

根据错误信息，SOAPpy没有添加SOAPAction这个HTTP头。这就是为什么SOAPpy在很多服务上无法正常工作的原因。你可以试试suds，下面是一个可以正常工作的例子：

from suds.client import Client

url = 'http://www.webservicex.net/WeatherForecast.asmx?WSDL'
client = Client(url)

print client.service.GetWeatherByPlaceName('Dallas')
print client.service.GetWeatherByZipCode ('33126')