Question

我遇到了基本身份验证问题，无法连接在Visual Studio中从ChannelBase派生的Web服务。已经尝试在MSDN中询问没有结果，所以我在这里试试运气。

这是情景：

a）Web服务需要基本身份验证（用户名和密码）并支持SOAP 1.1

b）我必须通过HTTP代理，再次需要基本身份验证。

我无法使用此功能：Web服务上的身份验证很好（如果绕过代理进行测试）但看起来我无法配置ChannelBase派生类来处理代理上的身份验证（在获得身份验证之后） HTTP响应它不会继续协商身份验证。）

这是我在app.config中的当前设置

<configuration>
 <system.serviceModel>
  <bindings>
   <customBinding>
    <binding name="LocationWSBinding" receiveTimeout="00:02:30">
     <textMessageEncoding messageVersion="Soap11" />
     <httpTransport authenticationScheme="Basic" proxyAddress="http://The.proxy.ip" useDefaultWebProxy="false" 
      bypassProxyOnLocal="True" proxyAuthenticationScheme="Basic" />
    </binding>
   </customBinding>
  </bindings>
  <client>
   <endpoint address="http://the.web.service"
      binding ="customBinding" bindingConfiguration="LocationWSBinding"
     contract="The.Contract.Name" name="LocationWSPort" />
  </client>
 </system.serviceModel>
</configuration>

在代码中，这是我指定凭据的地方：

TheClient WS = new TheClient（“LocationWSPort”）;

  WS.ClientCredentials.UserName.UserName = "WebServiceUsername";
  WS.ClientCredentials.UserName.Password = "WebServicepassword";
  WS.ChannelFactory.Credentials.Windows.ClientCredential = new NetworkCredential("Proxyusername","ProxyPassword");

你能帮帮我吗？

我不知道阻止客户端在请求时继续进行代理身份验证有什么问题。

谢谢Emanuele

恩里科，对不起，迟到了。我已经尝试过你的建议了，只有当我调用一个不需要参数的webservice方法时才会工作，当我调用一个需要复杂类型作为参数的方法时（这是我必须做的真正的调用以获得有用的有效负载）我得到以下内容错误：

{"The server did not provide a meaningful reply; this might be caused by a contract mismatch, a premature session shutdown or an internal server error."}
[System.ServiceModel.CommunicationException]: {"The server did not provide a meaningful reply; this might be caused by a contract mismatch, a premature session shutdown or an internal server error."}
_className: null
_data: {System.Collections.ListDictionaryInternal}
_dynamicMethods: null
_exceptionMethod: null
_exceptionMethodString: null
_helpURL: null
_HResult: -2146233087
_innerException: null
_ipForWatsonBuckets: 83189596
_message: "The server did not provide a meaningful reply; this might be caused by a contract mismatch, a premature session shutdown or an internal server error."
_remoteStackIndex: 1
_remoteStackTraceString: "\r\nServer stack trace: \r\n   at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)\r\n   at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)\r\n   at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)\r\n\r\nException rethrown at [0]: \r\n"
_safeSerializationManager: {System.Runtime.Serialization.SafeSerializationManager}
_source: null
_stackTrace: {sbyte[80]}
_stackTraceString: null
_watsonBuckets: null
_xcode: -532462766
_xptrs: 0
Data: {System.Collections.ListDictionaryInternal}
HelpLink: null
HResult: -2146233087
InnerException: null
IsTransient: false
Message: "The server did not provide a meaningful reply; this might be caused by a contract mismatch, a premature session shutdown or an internal server error."
Source: "mscorlib"
StackTrace: "\r\nServer stack trace: \r\n   at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)\r\n   at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)\r\n   at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)\r\n\r\nException rethrown at [0]: \r\n   at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)\r\n   at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)\r\n   at [.......] in E:\\VisualStudioPrj\\HTTPproxyTroubleshoot\\HTTPproxyTroubleshoot\\Program.cs:line 88"
TargetSite: {Void HandleReturnMessage(System.Runtime.Remoting.Messaging.IMessage, System.Runtime.Remoting.Messaging.IMessage)}

现在，我确信数据合同是正常的（如果我没有设置WebRequest.DefaultWebProxy，它会正常工作）。至于FTP，这些SOAP调用是由Windows服务运行的两个线程中的一个完成的，它们协调它们：另一个是处理FTP调用，我需要这些不通过代理转换，否则回答将被格式化为HTML，这扰乱了FTP通信...

Answer 1

您遇到的问题是由WCF will use the same set of client credentials both for service authentication and for upstream web proxy authentication引起的。由于您的服务需要与上游Web代理不同的凭据对，因此请求未经过正确身份验证，随后会被阻止。

由于您只能在ClientCredentials类上指定一组凭据，因此解决方案是设置凭据以便在较低级别使用Web代理，使用{ {3}}属性。

以下是一个例子：

var webProxy = new WebProxy
{
    Address = "http://myproxy:8080",
    Credentials = new NetworkCredential("username", "password")
};

WebRequest.DefaultWebProxy = webProxy;

然后，您应该告诉WCF使用刚刚通过WebRequest.DefaultWebProxy类配置的默认代理：

<bindings>
    <customBinding>
        <binding name="MyBinding">
            <textMessageEncoding messageVersion="Soap11" />
            <httpTransport authenticationScheme="Basic"
                           useDefaultWebProxy="true" 
                           bypassProxyOnLocal="true"
                           proxyAuthenticationScheme="Basic" />
        </binding>
    </customBinding>
</bindings>

相关资源：

WebProxy

使用WCF ChannelBase的HTTP代理基本身份验证

1 个答案: