pyopenssl.diff

diff --git a/urllib3/contrib/pyopenssl.py b/urllib3/contrib/pyopenssl.py
index c20ae46..2023fe4 100644
--- a/urllib3/contrib/pyopenssl.py
+++ b/urllib3/contrib/pyopenssl.py
@@ -202,6 +202,9 @@ class WrappedSocket(object):
 
     def _send_until_done(self, data):
         while True:
+            if has_memoryview and isinstance(data, memoryview):
+                data = data.tobytes()
+
             try:
                 return self.connection.send(data)
             except OpenSSL.SSL.WantWriteError: