CacheCow: Writing to the response body is invalid for responses with status code 304.

When I test with Postman sending the If-None-Match value, I get the 304 response code, but my Asp Core app logs the following error: Writing to the response body is invalid for responses with status code 304.

Here is the stack trace: [2019-11-26 15:27:43 Error] - 0HLRIMTOD75D9:00000002 -> Microsoft.AspNetCore.Server.Kestrel : Connection id "“0HLRIMTOD75D9"”, Request id "“0HLRIMTOD75D9:00000002"”: An unhandled exception was thrown by the application. System.InvalidOperationException: Writing to the response body is invalid for responses with status code 304. at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.ThrowWritingToResponseBodyNotSupported() at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.WriteAsync(ReadOnlyMemory1 data, CancellationToken cancellationToken) at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpResponseStream.WriteAsync(Byte[] buffer, Int32 offset, Int32 count, CancellationToken cancellationToken) at System.IO.MemoryStream.CopyToAsync(Stream destination, Int32 bufferSize, CancellationToken cancellationToken) at CacheCow.Server.CachingPipeline.After(HttpContext context, Object viewModel) at CacheCow.Server.Core.Mvc.HttpCacheFilter.OnResourceExecutionAsync(ResourceExecutingContext context, ResourceExecutionDelegate next) at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeNextResourceFilter() at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Rethrow(ResourceExecutedContext context) at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted) at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeFilterPipelineAsync() at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeAsync() at Microsoft.AspNetCore.Builder.RouterMiddleware.Invoke(HttpContext httpContext) at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context) at AspNetCoreRateLimit.RateLimitMiddleware1.Invoke(HttpContext context) at Microsoft.AspNetCore.Server.IISIntegration.IISMiddleware.Invoke(HttpContext httpContext) at Microsoft.AspNetCore.Builder.Extensions.UsePathBaseMiddleware.Invoke(HttpContext context) at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.ProcessRequests[TContext](IHttpApplication`1 application)