def _test_proxy_headers(http_cache=None): headers = _make_cache_headers() status = '200 OK' rewriter = UrlRewriter('20131010/http://example.com/', '/pywb/', rewrite_opts={'http_cache': http_cache}) rewritten = headerrewriter.rewrite(StatusAndHeaders(status, headers), rewriter, rewriter.get_cookie_rewriter()) return rewritten.status_headers