favicon subrequest for pyramid

gistfile1.py

def static_resources(config):
    config.add_static_view('static', 'static', cache_max_age=STATIC_MAX_AGE)

    favicon_path = '/static/img/favicon.ico'
    if config.route_prefix:
        favicon_path = '/%s%s' % (config.route_prefix, favicon_path)
    config.add_route('favicon.ico', 'favicon.ico')

    def favicon(request):
        subreq = request.copy()
        subreq.path_info = favicon_path
        response = request.invoke_subrequest(subreq)
        return response

    config.add_view(favicon, route_name='favicon.ico')