1 files changed, 7 insertions, 4 deletions
diff --git a/Lib/urllib/request.py b/Lib/urllib/request.py
index 96bb8d7..9cbf8aa 100644
--- a/Lib/urllib/request.py
+++ b/Lib/urllib/request.py
@@ -135,16 +135,19 @@ __version__ = sys.version[:3]
 
 _opener = None
 def urlopen(url, data=None, timeout=socket._GLOBAL_DEFAULT_TIMEOUT,
-            *, cafile=None, capath=None):
+            *, cafile=None, capath=None, cadefault=False):
     global _opener
-    if cafile or capath:
+    if cafile or capath or cadefault:
         if not _have_ssl:
             raise ValueError('SSL support not available')
         context = ssl.SSLContext(ssl.PROTOCOL_SSLv23)
         context.options |= ssl.OP_NO_SSLv2
-        if cafile or capath:
+        if cafile or capath or cadefault:
             context.verify_mode = ssl.CERT_REQUIRED
-            context.load_verify_locations(cafile, capath)
+            if cafile or capath:
+                context.load_verify_locations(cafile, capath)
+            else:
+                context.set_default_verify_paths()
             check_hostname = True
         else:
             check_hostname = False