diff --git a/requests/adapters.py b/requests/adapters.py
index 4f8e74e0..408d2f1f 100644
--- a/requests/adapters.py
+++ b/requests/adapters.py
@@ -10,20 +10,20 @@ and maintain connections.
 import os.path
 import socket
 
-from urllib3.poolmanager import PoolManager, proxy_from_url
-from urllib3.response import HTTPResponse
-from urllib3.util import Timeout as TimeoutSauce
-from urllib3.util.retry import Retry
-from urllib3.exceptions import ClosedPoolError
-from urllib3.exceptions import ConnectTimeoutError
-from urllib3.exceptions import HTTPError as _HTTPError
-from urllib3.exceptions import MaxRetryError
-from urllib3.exceptions import NewConnectionError
-from urllib3.exceptions import ProxyError as _ProxyError
-from urllib3.exceptions import ProtocolError
-from urllib3.exceptions import ReadTimeoutError
-from urllib3.exceptions import SSLError as _SSLError
-from urllib3.exceptions import ResponseError
+from requests_core.http_manager.poolmanager import PoolManager, proxy_from_url
+from requests_core.http_manager.response import HTTPResponse
+from requests_core.http_manager.util import Timeout as TimeoutSauce
+from requests_core.http_manager.util.retry import Retry
+from requests_core.http_manager.exceptions import ClosedPoolError
+from requests_core.http_manager.exceptions import ConnectTimeoutError
+from requests_core.http_manager.exceptions import HTTPError as _HTTPError
+from requests_core.http_manager.exceptions import MaxRetryError
+from requests_core.http_manager.exceptions import NewConnectionError
+from requests_core.http_manager.exceptions import ProxyError as _ProxyError
+from requests_core.http_manager.exceptions import ProtocolError
+from requests_core.http_manager.exceptions import ReadTimeoutError
+from requests_core.http_manager.exceptions import SSLError as _SSLError
+from requests_core.http_manager.exceptions import ResponseError
 
 from .models import Response
 from .basics import urlparse, basestring
@@ -49,7 +49,7 @@ from .exceptions import (
 from .auth import _basic_auth_str
 
 try:
-    from urllib3.contrib.socks import SOCKSProxyManager
+    from requests_core.http_manager.contrib.socks import SOCKSProxyManager
 except ImportError:
 
     def SOCKSProxyManager(*args, **kwargs):
diff --git a/requests/cookies.py b/requests/cookies.py
index 001d7e53..3359d1b7 100644
--- a/requests/cookies.py
+++ b/requests/cookies.py
@@ -139,7 +139,7 @@ def extract_cookies_to_jar(jar, request, response):
     # the _original_response field is the wrapped httplib.HTTPResponse object,
     req = MockRequest(request)
     # pull out the HTTPMessage with the headers and put it in the mock:
-    res = MockResponse(response._original_response.msg)
+    res = MockResponse(response._original_response.headers)
     jar.extract_cookies(res, req)
 
 
diff --git a/requests/models.py b/requests/models.py
index 4497271e..a2029b29 100644
--- a/requests/models.py
+++ b/requests/models.py
@@ -773,7 +773,7 @@ class Response(object):
             if hasattr(self.raw, 'stream'):
                 try:
                     for chunk in self.raw.stream(
-                        chunk_size, decode_content=True
+                        chunk_size, # decode_content=True
                     ):
                         yield chunk