How can I use WebHttpRelayBinding with application/json requests? - azure

Question

When I try to use a generic message handler, I run into errors when the accept, or content-type is html/xml/json if I use my own type such as text/x-json everything works as expected the message is dispatched to my handlers and the stream returns the data to the webclient. I have stepped through this with a debugger and my code successfully creates the message but something in the servicebus binding chokes and causes the server not to respond. Is there a setting I need to change to allow application/json and make the service bus send raw data rather then trying to reserialize it?
[WebGet( UriTemplate = "*" )]
[OperationContract( AsyncPattern = true )]
public IAsyncResult BeginGet( AsyncCallback callback, object state )
{
var context = WebOperationContext.Current;
return DispatchToHttpServer( context.IncomingRequest, null, context.OutgoingResponse, _config.BufferRequestContent, callback, state );
}
public Message EndGet( IAsyncResult ar )
{
var t = ar as Task<Stream>;
var stream = t.Result;
return StreamMessageHelper.CreateMessage( MessageVersion.None, "GETRESPONSE", stream ?? new MemoryStream() );
}

Answer 1

Instead of using: StreamMessageHelper.CreateMessage, you can use the following one after you change :
WebOperationContext.Current.OutgoingResponse.ContentTYpe = "application/json"
public Message CreateJsonMessage(MessageVersion version, string action, Stream jsonStream)
{
var bodyWriter = new JsonStreamBodyWriter(jsonStream);
var message = Message.CreateMessage(version, action, bodyWriter);
message.Properties.Add(WebBodyFormatMessageProperty.Name, new WebBodyFormatMessageProperty(WebContentFormat.Json));
return message;
}
class JsonStreamBodyWriter : BodyWriter
{
Stream jsonStream;
public JsonStreamBodyWriter(Stream jsonStream)
: base(false)
{
this.jsonStream = jsonStream;
}
protected override void OnWriteBodyContents(XmlDictionaryWriter writer)
{
writer.WriteNode(JsonReaderWriterFactory.CreateJsonReader(this.jsonStream, XmlDictionaryReaderQuotas.Max), false);
writer.Flush();
}
}