This attribute forces a particular request to be secure (over SSL).

SecureRequestFilterAttribute.cs

public class SecureRequestFilterAttribute : Attribute, IHasRequestFilter
{
    public IHasRequestFilter Copy()
    {
        return this;
    }

    public int Priority
    {
        // https://github.com/ServiceStack/ServiceStack/issues/119
        // By setting priority to -100, this filter will be applied first.
        get { return -100; }
    }

    public void RequestFilter(IHttpRequest req, IHttpResponse res, object requestDto)
    {
        // https://groups.google.com/d/msg/servicestack/7JnQ8eLf36M/JFx2g7xEeEkJ
        if (!req.IsSecureConnection)
        {
            res.StatusCode = (int)HttpStatusCode.Forbidden;
            res.Close();
        }
    }
}