Dynamic template loader with TemplateResponse

I have some legacy code that I used to dynamically load a template based on url if it exists and render a 404 if it doesn't exist.

def content(request, template_name='index'):

    try:

        return direct_to_template(request, '%s.html' % template_name)

    except TemplateDoesNotExist:

        raise Http404

I'm having difficulty conceptualizing how to do this in trunk (1.4) with TemplateResponse.  Since everything happens inside response.render() outside of the view, I do not have that level of control at this stage.

Should I extend BaseLoader to load the 404 template instead of raising an exception if it is not found?  Or should I extend SimpleTemplateResponse to do something similar?  Or is there a better way to do this?

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