Implementing [RequireHttps] with ASP.NET Web API

http://blogs.msdn.com/b/carlosfigueira/archive/2012/03/09/implementing-requirehttps-with-asp-net-web-api.aspx

public class RequireHttpsAttribute : AuthorizationFilterAttribute
{
    public override void OnAuthorization(HttpActionContext actionContext)
    {
        var request = actionContext.Request;
        if (request.RequestUri.Scheme != Uri.UriSchemeHttps)
        {
            HttpResponseMessage response;
            UriBuilder uri = new UriBuilder(request.RequestUri);
            uri.Scheme = Uri.UriSchemeHttps;
            uri.Port = 443;
            string body = string.Format("<p>The resource can be found at <a href=\"{0}\">{0}</a>.</p>",
                uri.Uri.AbsoluteUri);
            if (request.Method.Equals(HttpMethod.Get) || request.Method.Equals(HttpMethod.Head))
            {
                response = request.CreateResponse(HttpStatusCode.Found);
                response.Headers.Location = uri.Uri;
                if (request.Method.Equals(HttpMethod.Get))
                {
                    response.Content = new StringContent(body, Encoding.UTF8, "text/html");
                }
            }
            else
            {
                response = request.CreateResponse(HttpStatusCode.NotFound);
                response.Content = new StringContent(body, Encoding.UTF8, "text/html");
            }

            actionContext.Response = response;
        }
    }
}