WCF Service receives null request - wcf

Question

var dataToSend = Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(mi));
var req = HttpWebRequest.Create("http://localhost/Service1.svc/json/MethodName");
req.ContentType = "application/json";
req.ContentLength = dataToSend.Length;
req.Method = "POST";
req.GetRequestStream().Write(dataToSend, 0, dataToSend.Length);
var response = req.GetResponse();
Here "/json" is my endpoint address and my service is configured with multiple endpoints. As per image here, request i sent is recieving null at server.
If my request format is not proper then suggest proper way to call this service.
// Service inter face
[ServiceContract]
public interface IService
{
[OperationContract]
[WebInvoke(Method="POST")]
Response MethodName(Request request);
}
// Service1
public class Service1 : IService
{
public Response MethodName(Request request)
{
some logical operation....
}
}
// End point configuration (Web config)
<endpoint address="json" behaviorConfiguration="jsonBehavior"
binding="webHttpBinding" bindingConfiguration="webHttpBindingJson"
name="jsonn" contract="Service1.IService" />
<endpoint address="xml" behaviorConfiguration="poxBehavior" binding="webHttpBinding"
bindingConfiguration="webHttpBindingXml" name="xmll" contract="Service1.IService" />
<endpointBehaviors>
<behavior name="jsonBehavior">
<enableWebScript />
</behavior>
<behavior name="poxBehavior">
<enableWebScript />
</behavior>
</endpointBehaviors>
<webHttpBinding>
<binding name="webHttpBindingJson">
<security mode="None" />
</binding>
<binding name="webHttpBindingXml">
<security mode="None" />
</binding>
</webHttpBinding>
// Request class
[DataContract]
public class Request
{
string userMobile;
string otp;
[DataMember]
public string UserMobile
{
get { return userMobile; }
set { userMobile = value; }
}
[DataMember]
public string OTP
{
get { return otp; }
set { otp = value; }
}
}

Answer 1

Finally i found for this.
I modified endpoint of json behaviour configuration to this,
<behavior name="jsonBehavior">
<webHttp defaultBodyStyle ="Bare"/>
<!--<enableWebScript />-->
</behavior>
and removed enableWebScript. Finally my code working.