commit d16a94e6a64cf2d0ff9bf3e926b4e08a383faae2
Author: John Vandenberg <jayvdb@gmail.com>
Date:   Sun Jan 9 11:31:02 2022 +0800

    Use collections.abc

diff --git a/hyper/common/headers.py b/hyper/common/headers.py
index 655a591..6454f55 100644
--- a/hyper/common/headers.py
+++ b/hyper/common/headers.py
@@ -10,7 +10,7 @@ import collections
 from hyper.common.util import to_bytestring, to_bytestring_tuple
 
 
-class HTTPHeaderMap(collections.MutableMapping):
+class HTTPHeaderMap(collections.abc.MutableMapping):
     """
     A structure that contains HTTP headers.
 
diff --git a/hyper/http11/connection.py b/hyper/http11/connection.py
index 4311d30..3405286 100644
--- a/hyper/http11/connection.py
+++ b/hyper/http11/connection.py
@@ -10,7 +10,7 @@ import os
 import socket
 import base64
 
-from collections import Iterable, Mapping
+from collections.abc import Iterable, Mapping
 
 import collections
 from hyperframe.frame import SettingsFrame
@@ -390,7 +390,7 @@ class HTTP11Connection(object):
                 return
 
             # Iterables that set a specific content length.
-            elif isinstance(body, collections.Iterable):
+            elif isinstance(body, Iterable):
                 for item in body:
                     try:
                         self._sock.send(item)