OData v4 DefaultODataBatchHandler NotImplementedException - odata

Question

In my web service I've setup for batch requests. I wrapped the DefaultODataBatchHandler class just to add break points. It is processing the requests successfully and the CreateResponseMessageAsync method is creating a 200 OK response. But the client is receiving the following:
{
"Message": "An error has occurred.",
"ExceptionMessage": "The method or operation is not implemented.",
"ExceptionType": "System.NotImplementedException",
"StackTrace": " at System.Web.HttpContextBase.get_Response()\r\n at System.Web.UI.Util.GetUrlWithApplicationPath(HttpContextBase context, String url)\r\n at System.Web.Routing.RouteCollection.NormalizeVirtualPath(RequestContext requestContext, String virtualPath)\r\n at System.Web.Routing.RouteCollection.GetVirtualPath(RequestContext requestContext, String name, RouteValueDictionary values)\r\n at System.Web.Http.WebHost.Routing.HostedHttpRouteCollection.GetVirtualPath(HttpRequestMessage request, String name, IDictionary`2 values)\r\n at System.Web.Http.Routing.UrlHelper.GetVirtualPath(HttpRequestMessage request, String routeName, IDictionary`2 routeValues)\r\n at System.Web.Http.Routing.UrlHelper.Route(String routeName, IDictionary`2 routeValues)\r\n at System.Web.Http.Routing.UrlHelper.Link(String routeName, IDictionary`2 routeValues)\r\n at System.Web.OData.Extensions.UrlHelperExtensions.CreateODataLink(UrlHelper urlHelper, String routeName, IODataPathHandler pathHandler, IList`1 segments)\r\n at System.Web.OData.Extensions.UrlHelperExtensions.CreateODataLink(UrlHelper urlHelper, IList`1 segments)\r\n at System.Web.OData.Formatter.ODataMediaTypeFormatter.GetDefaultBaseAddress(HttpRequestMessage request)\r\n at System.Web.OData.Formatter.ODataMediaTypeFormatter.GetBaseAddressInternal(HttpRequestMessage request)\r\n at System.Web.OData.Formatter.ODataMediaTypeFormatter.WriteToStream(Type type, Object value, Stream writeStream, HttpContent content, HttpContentHeaders contentHeaders)\r\n at System.Web.OData.Formatter.ODataMediaTypeFormatter.WriteToStreamAsync(Type type, Object value, Stream writeStream, HttpContent content, TransportContext transportContext, CancellationToken cancellationToken)\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Net.Http.HttpContent.<CopyToAsyncCore>d__44.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.OData.Batch.ODataBatchResponseItem.<WriteMessageAsync>d__0.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.OData.Batch.ODataBatchContent.<SerializeToStreamAsync>d__0.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Net.Http.HttpContent.<LoadIntoBufferAsyncCore>d__49.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.Http.Owin.HttpMessageHandlerAdapter.<BufferResponseContentAsync>d__13.MoveNext()"
}
I have no idea why or where this is coming from.
ODataConfig.cs
public static void Register(HttpConfiguration config)
{
config.MapHttpAttributeRoutes();
config.Routes.MapHttpRoute(
name: "DefaultApi",
routeTemplate: "api/{controller}/{id}",
defaults: new { id = RouteParameter.Optional }
);
var builder = new ODataConventionModelBuilder();
var tags = builder.EntitySet<EventTag>("EventTags");
tags.HasOptionalBinding(x => x.Parent, tags);
var events = builder.EntitySet<Event>("Events");
events.HasManyBinding(x => x.Tags, tags);
var batchHandler = new DefaultODataBatchHandler(GlobalConfiguration.DefaultServer);
config.MapODataServiceRoute("odata", "odata", builder.GetEdmModel(), batchHandler);
}
}

Answer 1

I resolved this by making sure I called into Register with a new instance of HttpConfiguration, rather than re-using one from before (which I had wired up Autofac on). I guess you could get the same problems if you tried to wire this up using GlobalConfiguration.Configuration.
Trick is to set up WebApi on a new HttpConfiguration instance.