Question

我已经看到了很多关于此问题的问题，但我找不到代码中缺少的内容。

我正在实施CORS因为我不想使用JSONP。

我知道这是preflighted request，我想我正在添加正确的headers。

错误是该网站似乎不喜欢我的WCF，每次我发出请求时，即使我拥有OPTION标题，也会调用Access-Control-Allow-Methods方法

我只想通过POST

对我的WCF进行contentType: "application/json",来电

WCF是自托管的，网络应用程序位于IIS 7.5。

Chrome显示的内容：

enter image description here

小提琴手显示 enter image description here

合同

<OperationContract()>
<WebInvoke(Method:="POST",
           RequestFormat:=WebMessageFormat.Json,
           ResponseFormat:=WebMessageFormat.Json,
           BodyStyle:=WebMessageBodyStyle.WrappedRequest)>
<FaultContract(GetType(ServiceFault))>
Function LookUpPerson(person As Person) _
                     As List(Of Person)

的app.config

<serviceHostingEnvironment multipleSiteBindingsEnabled="true" aspNetCompatibilityEnabled="true" />
<bindings>
  <webHttpBinding>
    <binding name="webHttpBindingWithJsonP"
             crossDomainScriptAccessEnabled="true">
      <security mode="None" />
    </binding>
  </webHttpBinding>
</bindings>

<services>
  <service name="Project.Services.Person">  
    <endpoint address="ws"  binding="wsHttpBinding"     contract="Project.Services.Interfaces.IPublic" />   
    <endpoint address=""    binding="webHttpBinding"    contract="Project.Services.Interfaces.IPublic"
              behaviorConfiguration="jsonBehavior"/>
    <host>
      <baseAddresses>
        <add baseAddress="http://localhost:8732/" />
      </baseAddresses>
    </host>
  </service>
</services>

<extensions>
  <behaviorExtensions>
    <add name="customHeaders"
         type="Project.Services.Utilities.EnableCrossOriginResourceSharingBehavior, Project.Services, Version=1.0.0.0, Culture=neutral"/>
  </behaviorExtensions>
</extensions>

<endpointBehaviors>
  <behavior name="jsonBehavior">
    <webHttp/>
    <customHeaders />
  </behavior>
</endpointBehaviors>

的javascript

$.ajax({
    url: "http://192.168.0.61:8282/Project.Services.Person/LookUpPerson",
    type: "POST",
    contentType: "application/json",
    crossDomain: true,
    dataType: "json",
    data: { person: JSON.stringify(person) },
    success: function (data) {
        // doing something
    },
    error: function (error) {
        // doing something
    }
});

根据http://enable-cors.org/server_wcf.html

，在WCF上我有以下处理程序

Public Class CustomHeaderMessageInspector
        Implements IDispatchMessageInspector

        Private requiredHeaders As Dictionary(Of String, String)
        Public Sub New(headers As Dictionary(Of String, String))
            requiredHeaders = If(headers, New Dictionary(Of String, String)())
        End Sub

        Public Function AfterReceiveRequest(ByRef request As System.ServiceModel.Channels.Message,
                                            channel As System.ServiceModel.IClientChannel,
                                            instanceContext As System.ServiceModel.InstanceContext) _
                                        As Object _
                                        Implements System.ServiceModel.Dispatcher.IDispatchMessageInspector.AfterReceiveRequest
            Return Nothing
        End Function

        Public Sub BeforeSendReply(ByRef reply As System.ServiceModel.Channels.Message,
                                   correlationState As Object) _
                               Implements System.ServiceModel.Dispatcher.IDispatchMessageInspector.BeforeSendReply
            Dim httpHeader = TryCast(reply.Properties("httpResponse"), HttpResponseMessageProperty)
            For Each item In requiredHeaders
                httpHeader.Headers.Add(item.Key, item.Value)
            Next
        End Sub

    End Class

和

Public Class EnableCrossOriginResourceSharingBehavior
        Inherits BehaviorExtensionElement
        Implements IEndpointBehavior

        Public Sub AddBindingParameters(endpoint As ServiceEndpoint, bindingParameters As System.ServiceModel.Channels.BindingParameterCollection) _
                                        Implements System.ServiceModel.Description.IEndpointBehavior.AddBindingParameters

        End Sub

        Public Sub ApplyClientBehavior(endpoint As ServiceEndpoint, clientRuntime As System.ServiceModel.Dispatcher.ClientRuntime) _
                                         Implements System.ServiceModel.Description.IEndpointBehavior.ApplyClientBehavior

        End Sub

        Public Sub ApplyDispatchBehavior(endpoint As ServiceEndpoint, endpointDispatcher As System.ServiceModel.Dispatcher.EndpointDispatcher) _
                                        Implements System.ServiceModel.Description.IEndpointBehavior.ApplyDispatchBehavior
            Dim requiredHeaders = New Dictionary(Of String, String)()

            requiredHeaders.Add("Access-Control-Allow-Origin", "*")
            requiredHeaders.Add("Access-Control-Allow-Methods", "POST, GET, OPTIONS")
            requiredHeaders.Add("Access-Control-Allow-Headers", "Origin, Content-Type, Accept")
            requiredHeaders.Add("Access-Control-Max-Age", "1728000")

            endpointDispatcher.DispatchRuntime.MessageInspectors.Add(New CustomHeaderMessageInspector(requiredHeaders))
        End Sub

        Public Sub Validate(endpoint As ServiceEndpoint) _
            Implements System.ServiceModel.Description.IEndpointBehavior.Validate

        End Sub

        Public Overrides ReadOnly Property BehaviorType() As Type
            Get
                Return GetType(EnableCrossOriginResourceSharingBehavior)
            End Get
        End Property

        Protected Overrides Function CreateBehavior() As Object
            Return New EnableCrossOriginResourceSharingBehavior()
        End Function

    End Class

对于这篇长篇文章感到抱歉，我想具体一点。

提前致谢。

更新

如果我使用contentType: "text/plain"，我会在Chrome控制台上收到错误：

POST http://192.168.0.61:8282/Project.Services.Person/LookUpPerson 400（错误请求）

Answer 1

我遇到了同样的问题，并为我解决了这个问题。

更改

[WebInvoke(Method = "Post")]

到

[WebInvoke(Method = "*")]

因为虽然您接受POST，但现代浏览器始终会发送OPTIONS。

jQuery .ajax（）405（不允许的方法）/跨域

1 个答案: