diff -r 5cc14407a739 -r bfd072c52e03 mercurial/httppeer.py
--- a/mercurial/httppeer.py	Fri Dec 01 14:13:55 2017 -0800
+++ b/mercurial/httppeer.py	Fri Dec 01 16:53:55 2017 +0530
@@ -222,7 +222,7 @@
             if not data:
                 data = strargs
             else:
-                if isinstance(data, basestring):
+                if isinstance(data, bytes):
                     i = io.BytesIO(data)
                     i.length = len(data)
                     data = i