Issue #26864: Merge no_proxy fixes from 3.5

diff --cc Lib/urllib/request.py
Simple merge

diff --cc Misc/NEWS
index 7b3bbd7866a71609420666867938f4691679e095,67c2a17e5d18f2ef9900e4fa2e3850e52a57640c..d6c30dbf430d355436e65bd9c0cf84f35aa90962
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -256,12 -106,12 +256,17 @@@ Core and Builtin
  Library
  -------
  
+ - Issue #26864: In urllib.request, change the proxy bypass host checking
+   against no_proxy to be case-insensitive, and to not match unrelated host
+   names that happen to have a bypassed hostname as a suffix.  Patch by Xiang
+   Zhang.
+ 
 +- Issue #24902: Print server URL on http.server startup.  Initial patch by
 +  Felix Kaiser.
 +
 +- Issue #25788: fileinput.hook_encoded() now supports an "errors" argument
 +  for passing to open.  Original patch by Joseph Hackman.
 +
  - Issue #26634: recursive_repr() now sets __qualname__ of wrapper.  Patch by
    Xiang Zhang.