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I am writing a POC application which uses Microsoft.ServiceBus.dll 1.0.0.0 (the .NET 3.5 version). My WCF contract and service look like the following: [ServiceContract(Name="MyServiceContract", Namespace = "http://mydomain.com/")] internal interface IServiceContract { [WebInvoke(Method = "POST", UriTemplate = "/DoOperation")] [OperationContract] Stream RelayRequest(Stream requestBody); } [ServiceBehavior(Name = "Service1", Namespace = "http://mydomain.com/Service1/", InstanceContextMode = InstanceContextMode.Single)] internal class Service1 : IServiceContract { Stream RelayRequest(Stream requestBody) { var contents = GetJsonResponse(); var responseStream = new MemoryStream(); var streamWriter = new StreamWriter(responseStream); streamWriter.AutoFlush = true; var writer = new JsonTextWriter(streamWriter); var serializer = new JsonSerializer(); serializer.Serialize(responseStream, contents); responseStream.Position = 0 // reset the position of the stream so that it's contents will be read from the beginning. //Problem Line: WebOperationContext.OutgoingResponse.ContentType = "application/json"; return responseStream; } } The listening end point is configured to use WebHttpRelayBinding: SecurityMode: Transport TransferMode: Streamed When I attempt to assign the ContentType of the outgoing response to "application/json" an error doesn't occur but the calling request returns with status code 504 (Gateway Timeout). If I change the ContentType to "text/javascript" the calling request returns with 200 (OK). Some things to note: The content-type is not known until run time so it must be dynamically assigned. The contents of the stream is pure - 100% valid - json. The intention for accepting and returning a stream is so we can accep

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