merge from 3.4

Fix Issue #8797: Raise HTTPError on failed Basic Authentication immediately. Initial patch by Sam Bull.

diff --cc Misc/NEWS
index 66fc45e90e8a38a58a6aa212904552a9f17c3bfe,32f8cfcd8e350e6d16070d7a4d1c49cb85f9ecf7..43c4b3f43dd56f30d5fedf36bee3a4b14a671be3
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -115,8 -27,9 +115,11 @@@ Core and Builtin
  Library
  -------
  
+ - Issue #8797: Raise HTTPError on failed Basic Authentication immediately.
+   Initial patch by Sam Bull.
+ 
 +- Issue #15381: Optimized line reading in io.BytesIO.
 +
  - Issue #20729: Restored the use of lazy iterkeys()/itervalues()/iteritems()
    in the mailbox module.