How to make custom WCF error handler return JSON response with non-OK http code?

Question

I\'m implementing a RESTful web service using WCF and the WebHttpBinding. Currently I\'m working on the error handling logic, implementing a custom error handler (IErrorHand

Answer 1

Double-check that your errorObject can be serialized by DataContractJsonSerializer. I ran into a problem where my contract implementation didn't provide a setter for one of the properties and was silently failing to serialize--resulting in similar symptoms: 'server did not send a response'.

Here's the code I used to get more details about the serialization error (makes a good unit test with an assertion and without the try/catch for breakpoint purposes):

Stream s = new MemoryStream();
try
{
    new DataContractJsonSerializer(typeof(ErrorObjectDataContractClass)).WriteObject(s, errorObject);
} catch(Exception e)
{
    e.ToString();
}
s.Seek(0, SeekOrigin.Begin);
var json = new StreamReader(s, Encoding.UTF8).ReadToEnd();