WebAPI CORS with Windows Authentication – allow Anonymous OPTIONS request

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I used self-hosting with HttpListener and following solution worked for me:

  1. I allow anonymous OPTIONS requests
  2. Enable CORS with SupportsCredentials set true
var cors = new EnableCorsAttribute("*", "*", "*");
cors.SupportsCredentials = true;
config.EnableCors(cors);
var listener = appBuilder.Properties["System.Net.HttpListener"] as HttpListener;
if (listener != null)
{
    listener.AuthenticationSchemeSelectorDelegate = (request) => {
    if (String.Compare(request.HttpMethod, "OPTIONS", true) == 0)
    {
        return AuthenticationSchemes.Anonymous;
    }
    else
    {
        return AuthenticationSchemes.IntegratedWindowsAuthentication;
    }};
}

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