Index: Lib/http/client.py
===================================================================
--- Lib/http/client.py	(revision 86667)
+++ Lib/http/client.py	(working copy)
@@ -71,6 +71,7 @@
 import io
 import os
 import socket
+import gzip
 from urllib.parse import urlsplit
 import warnings
 
@@ -491,6 +492,10 @@
             self.close()
             return b""
 
+        if self.getheader('Content-Encoding') == 'gzip':
+            self.fp = gzip.GzipFile(fileobj=self.fp, mode='rb')
+            self.length = None
+
         if self.chunked:
             return self._read_chunked(amt)
 
Index: Lib/urllib/request.py
===================================================================
--- Lib/urllib/request.py	(revision 86676)
+++ Lib/urllib/request.py	(working copy)
@@ -1084,6 +1084,10 @@
         headers = dict(req.unredirected_hdrs)
         headers.update(dict((k, v) for k, v in req.headers.items()
                             if k not in headers))
+        hasAcceptEncoding = ("Accept-Encoding" in headers or
+                "Accept-encoding" in headers)
+        if not hasAcceptEncoding:
+            headers["Accept-Encoding"] = "gzip"
 
         # TODO(jhylton): Should this be redesigned to handle
         # persistent connections?