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--- contrib/python/tornado/tornado-4/tornado/httputil.py (index)
+++ contrib/python/tornado/tornado-4/tornado/httputil.py (working tree)
@@ -31,6 +31,11 @@ import numbers
import re
import time
+try:
+ from collections.abc import MutableMapping
+except ImportError:
+ from collections import MutableMapping
+
from tornado.escape import native_str, parse_qs_bytes, utf8
from tornado.log import gen_log
from tornado.util import ObjectDict, PY3
@@ -103,7 +108,7 @@ class _NormalizedHeaderCache(dict):
_normalized_headers = _NormalizedHeaderCache(1000)
-class HTTPHeaders(collections.MutableMapping):
+class HTTPHeaders(MutableMapping):
"""A dictionary that maintains ``Http-Header-Case`` for all keys.
Supports multiple values per key via a pair of new methods,
END()
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