Bad Request Error On REST service Method call with POST (json Data)?

问题

Hi i am new to the RESTful WCF I am trying to do the the simple call to the webservice method using POST here is my code

Service Interface code

 [ServiceContract]
public interface IJsonSave
{

    [OperationContract]
    [WebInvoke(UriTemplate = "/SaveJason", RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json,
        Method = "POST", BodyStyle = WebMessageBodyStyle.WrappedRequest)]
    string SaveJason(string value);
}

web.config file code

<?xml version="1.0"?>
<configuration>

  <system.web>
    <compilation debug="true" targetFramework="4.0" />
  </system.web>
  <system.serviceModel>
   <behaviors>
     <serviceBehaviors>
       <behavior name ="servicebehavior">
          <!-- To avoid disclosing metadata information, set the value below to false and remove the metadata endpoint above before deployment -->
          <serviceMetadata httpGetEnabled="true"/>
          <!-- To receive exception details in faults for debugging purposes, set the value below to true.  Set to false before deployment to avoid disclosing exception information -->
          <serviceDebug includeExceptionDetailInFaults="true"/>
   </behavior>
  </serviceBehaviors>
  <endpointBehaviors>
    <behavior name="restbehavior">
      <webHttp/>
    </behavior>
  </endpointBehaviors>
</behaviors>
<services>
  <service name ="JsonDataSave.JsonSave"
           behaviorConfiguration ="servicebehavior" >
    <endpoint name ="SOAPEndPoint"
              contract ="JsonDataSave.IJsonSave"
              binding ="basicHttpBinding"
              address ="soap" />
    <endpoint name ="RESTEndPoint"
              contract ="JsonDataSave.IJsonSave"
              binding ="webHttpBinding"
              address ="Rest"
              behaviorConfiguration ="restbehavior" />
    <endpoint contract="IMetadataExchange"
              binding="mexHttpBinding"
              address="mex" />
  </service>
</services>
<serviceHostingEnvironment multipleSiteBindingsEnabled="true" />
</system.serviceModel>
<system.webServer>
  <modules runAllManagedModulesForAllRequests="true"/>
 </system.webServer>

</configuration>

I tried using fiddler her are my Headers

POST http://localhost:50267/JsonSave.svc/Rest/SaveJason
User-Agent: Fiddler
Content-Type: application/json
Data-Type: json
Host: localhost:50267

Request Body :

 ({"value":"asdfasd"})

It gives error of HTTP/1.1 400 Bad Request and when debug detail enabled it gives following stack trace

The server encountered an error processing the request. The exception message is 'Error    in deserializing body of request message for operation 'SaveJason'. The OperationFormatter could not deserialize any information from the Message because the Message is empty (IsEmpty = true).'. See server logs for more details. The exception stack trace is: 
at System.ServiceModel.Dispatcher.PrimitiveOperationFormatter.DeserializeRequest(Message message, Object[] parameters) at System.ServiceModel.Dispatcher.DemultiplexingDispatchMessageFormatter.DeserializeRequest(Message message, Object[] parameters) at System.ServiceModel.Dispatcher.UriTemplateDispatchFormatter.DeserializeRequest(Message message, Object[] parameters) at System.ServiceModel.Dispatcher.CompositeDispatchFormatter.DeserializeRequest(Message message, Object[] parameters) at System.ServiceModel.Dispatcher.DispatchOperationRuntime.DeserializeInputs(MessageRpc& rpc) at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc& rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc& rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage41(MessageRpc& rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage4(MessageRpc& rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage31(MessageRpc& rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage3(MessageRpc& rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage2(MessageRpc& rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage11(MessageRpc& rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage1(MessageRpc& rpc) at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet)

I googled a lot and tried every solution there is available but it still didn't work any help would be great.And it works for the SOAP just gives error with REST!

回答1:

In order to gather additional information about the data flow and location of the error you may benefit from enabling WCF Tracing on the service side. The following link should provide sufficient details: http://msdn.microsoft.com/en-us/library/ms733025(v=vs.110).aspx

Regarding the error in your scenario, I suspect that the message encoding is not set consistently for the client and service. I wonder if maybe the:

BodyStyle = WebMessageBodyStyle.WrappedRequest

should be either:

BodyStyle = WebMessageBodyStyle.Wrapped

or

BodyStyle = WebMessageBodyStyle.Bare

so the request and response have the same wrapping style.

Regards,

来源：https://stackoverflow.com/questions/20325516/bad-request-error-on-rest-service-method-call-with-post-json-data