WCF method call from browser returns 400 bad request

Question

I am using ASP.NET 3.5 with C# in visual studio 2008. I am naive to WCF. I have created a sample wcf application and just run it on asp.net development server in visual studio. I am calling the GetData() method i.e. auto-generated while creating applicaiton and getting 400 bad request. I have tried a lot but result is frustrating.

My Interface IService1.cs is as below :

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.Text;
using System.ServiceModel.Web;
using System.ServiceModel.Activation;

namespace WcfService1
{
    // NOTE: If you change the interface name "IService1" here, you must also update the reference to "IService1" in Web.config.
    [ServiceContract]
    public interface IService1
    {

        [OperationContract]
        [WebInvoke(RequestFormat=WebMessageFormat.Json,ResponseFormat=WebMessageFormat.Json,Method="GET",UriTemplate="/getdata/{}")]
        string GetData(int value);

        [OperationContract]
        CompositeType GetDataUsingDataContract(CompositeType composite);

        // TODO: Add your service operations here
    }


    // Use a data contract as illustrated in the sample below to add composite types to service operations.
    [DataContract]
    public class CompositeType
    {
        bool boolValue = true;
        string stringValue = "Hello ";

        [DataMember]
        public bool BoolValue
        {
            get { return boolValue; }
            set { boolValue = value; }
        }

        [DataMember]
        public string StringValue
        {
            get { return stringValue; }
            set { stringValue = value; }
        }
    }
}

And Class Service1.svc.cs file is as below :

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.Text;

namespace WcfService1
{
    // NOTE: If you change the class name "Service1" here, you must also update the reference to "Service1" in Web.config and in the associated .svc file.
    public class Service1 : IService1
    {
        public string GetData(int value)
        {
            return string.Format("You entered: {0}", value);
        }

        public CompositeType GetDataUsingDataContract(CompositeType composite)
        {
            if (composite.BoolValue)
            {
                composite.StringValue += "Suffix";
            }
            return composite;
        }
    }
}

And web.config is as below :

The URL is as below :

http://localhost:51671/Service1.svc/getdata/1

Can anyone help?

Mike Goodwin · Accepted Answer

There are 4 things wrong:

First, you should be using webHttpBinding instead of wsHttpBinding. wsHttpBinding is for SOAP services only - not REST services.

Second, you need to add an endpoint behaviour.

So, your endpoint will look like this:

And in the behaviors section you should have

Third, your URI template should be

UriTemplate="/getdata/{value}"

Rather than

UriTemplate="/getdata/{}"

And finally, the parameters you use in the URI template must be of type string, so

string GetData(string value);

rather than

string GetData(int value);

Inside your service operation you will have to parse the string value into the correct type.

Overall, it is MUCH easier to do REST with ASP.Net WebAPI rather than WCF REST. If you can move to .Net 4 instead of 3.5 you will make much quicker progress and you will be working with a properly supported platform.

Also, for development you should set

So you can get more information on what goes wrong. Remember to set it back to false for production though.

WCF method call from browser returns 400 bad request

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