Do a little modernization.

src/allmydata/scripts/common_http.py

@@ -1,18 +1,11 @@
 """
 Ported to Python 3.
 """
-from __future__ import unicode_literals
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
-from future.utils import PY2
-if PY2:
-    from future.builtins import filter, map, zip, ascii, chr, hex, input, next, oct, open, pow, round, super, bytes, dict, list, object, range, str, max, min  # noqa: F401
 
 import os
 from io import BytesIO
-from six.moves import urllib, http_client
+from http import client as http_client
+import urllib
 import six
 import allmydata # for __full_version__