Question

I’m trying to send a POST request to a simple WCF service I wrote, but I keep getting a 400 Bad Request. I’m trying to send JSON data to the service. Can anyone spot what I’m doing wrong? 🙂

This is my service interface:

public interface Itestservice {     [OperationContract]     [WebInvoke(         Method = 'POST',         UriTemplate = '/create',         RequestFormat = WebMessageFormat.Json,         ResponseFormat = WebMessageFormat.Json)]     String Create(TestData testData); } 

The implementation:

public class testservice: Itestservice {     public String Create(TestData testData)     {         return 'Hello, your test data is ' + testData.SomeData;     } } 

The DataContract:

[DataContract] public class TestData {     [DataMember]     public String SomeData { get; set; } } 

And finally my client code:

private static void TestCreatePost() {     Console.WriteLine('testservice.svc/create POST:');     Console.WriteLine('-----------------------');      Uri address = new Uri('http://localhost:' + PORT + '/testweb/testservice.svc/create');      // Create the web request       HttpWebRequest request = WebRequest.Create(address) as HttpWebRequest;      // Set type to POST       request.Method = 'POST';     request.ContentType = 'application/x-www-form-urlencoded';     //request.ContentType = 'text/x-json';      // Create the data we want to send       string data = '{\'SomeData\':\'someTestData\'}';      // Create a byte array of the data we want to send       byte[] byteData = UTF8Encoding.UTF8.GetBytes(data);      // Set the content length in the request headers       request.ContentLength = byteData.Length;      // Write data       using (Stream postStream = request.GetRequestStream())     {         postStream.Write(byteData, 0, byteData.Length);     }      // Get response       using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)     {         // Get the response stream           StreamReader reader = new StreamReader(response.GetResponseStream());          // Console application output           Console.WriteLine(reader.ReadToEnd());     }      Console.WriteLine();     Console.WriteLine(); } 

Can anyone think of what I might be doing wrong? As you can see in the C# client I’ve tried both application/x-www-form-urlencoded and text/x-json for ContentType, thinking that might have something to do with it, but it doesn’t seem to. I’ve tried a GET version of this same service and it works fine, and returns a JSON version of TestData with no problem. But for POST, well, I’m pretty stuck at the moment on this 🙁

Answer 1

Have you tried ‘application/json’ instead of ‘text/x-json’. According to this Stack Overflow question application/json is the only valid json media type.