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<?xml version="1.0" encoding="utf-8"?>
<ServiceDefinition name="AzureCloudService" xmlns="http://schemas.microsoft.com/ServiceHosting/2008/10/ServiceDefinition" schemaVersion="2015-04.2.6">
  <WorkerRole name="WorkerRole" vmsize="Standard_D1_v2">
    <ConfigurationSettings>
      <Setting name="foo" />
    </ConfigurationSettings>
    <Runtime executionContext="limited">
      <EntryPoint>
        <ProgramEntryPoint commandLine="NetCoreConsoleApp.exe" setReadyOnProcessStart="true" />
      </EntryPoint>

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dotnet publish -r win-x64 -c Release /p:PublishSingleFile=true -o bin/publish

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using Microsoft.WindowsAzure.ServiceRuntime.Internal;
using System;
using System.Diagnostics;
using System.Threading;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)

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private class StartupWithEmptyContentTypeFormatter
{
    public void ConfigureServices(IServiceCollection services)
    {
        _ = services ?? throw new ArgumentNullException(nameof(services));

        services
            .AddMvc(o => { o.AddEmptyContentTypeFormatter(); })
            .WithController<TestController>();
    }

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public static class MvcApplicationPartManagerExtensions
{
    public static IMvcBuilder WithController<T>(this IMvcBuilder builder)
    {
        return builder.ConfigureApplicationPartManager(m =>
        {
            m.FeatureProviders.Add(new CustomControllerFeatureProvider(typeof(T).GetTypeInfo()));
        });
    }

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namespace Microsoft.AspNetCore.Mvc.Controllers
{
    /// <summary>
    /// Discovers controllers from a list of <see cref="ApplicationPart"/> instances.
    /// </summary>
    public class ControllerFeatureProvider : IApplicationFeatureProvider<ControllerFeature>
    {
     // ....
    }
}

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[Test]
public async Task Controller_ShouldReturn200WithJsonOutput_IfNoContentTypeIsProvided()
{
    // arrange
    var builder = new WebHostBuilder()
        .UseStartup<StartupWithEmptyContentTypeFormatter>();

    var server = new TestServer(builder);
    var client = server.CreateClient();

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private class TestController : Controller
{
    [HttpPost("/200")]
    public IActionResult HandlePost200([FromBody]InputRequestData data)
    {
        return Json(data);
    }
}

private class InputRequestData

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private class StartupWithEmptyContentTypeFormatter
{
    public void ConfigureServices(IServiceCollection services)
    {
        _ = services ?? throw new ArgumentNullException(nameof(services));

        services
            .AddMvc(o => { o.AddEmptyContentTypeFormatter(); });
    }

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public class EmptyContentTypeJsonInputFormatter : InputFormatter
{
    private readonly JsonInputFormatter _inner;

    public EmptyContentTypeJsonInputFormatter(JsonInputFormatter inner)
    {
        _inner = inner ?? throw new ArgumentNullException(nameof(inner));
    }

    public override bool CanRead(InputFormatterContext context)