Why won't my ASP.Net Core Web API Controller return XML?

Question

I have the following simple Web API controller:

    // GET: api/customers
    [HttpGet]
    public async Task Get()
        {
        var         


        

Answer 1

For MVC 1.1 you need to add the Package Microsoft.AspNetCore.Mvc.Formatters.Xml and edit your Startup.cs:

public void ConfigureServices(IServiceCollection services)
{
    services.AddMvc(options => { options.RespectBrowserAcceptHeader = true; })
        .AddXmlSerializerFormatters()
        .AddXmlDataContractSeria‌​lizerFormatters();
}

Now you can set the Accept Header:

XML: application/xml

JSON: application/json