wcf rest second parameter gets value of third if left empty

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WCF

REST

WCFServices

Hi, Need your help. I have created a Rest method which can take three parameters and all are empty. Here is the body.

[WebGet(
 RequestFormat = WebMessageFormat.Xml,
 ResponseFormat = WebMessageFormat.Xml,
 UriTemplate = "Customer/GetAllProblemsByCityZipState/{City=null}/{Zip=null}/{State=null}",
 BodyStyle = WebMessageBodyStyle.Bare)]
public Message GetAllProblemsByCityZipState(string City, string Zip, string State)
{
    Message msg = Message.CreateMessage(MessageVersion.None, "");
    return msg;
}

I want to pass null to Zip from Client.When I am calling this method from fiddler using below URL.

http://localhost:2313/WebServices/CustomerServices.svc/
Customer/GetAllProblemsByCityZipState/1//3

the WCF service dispatcher assigning 3 to Zip instead of state as bellow
City = 1
Zip = 3
State = null

I need state Zip = null and state = 3... Could you please help me out.

Thanks in advance.