diff -r 970967e0a917 -r fda0867cfe03 mercurial/httppeer.py
--- a/mercurial/httppeer.py	Fri Aug 04 15:49:36 2017 -0400
+++ b/mercurial/httppeer.py	Sun Aug 06 17:44:56 2017 -0700
@@ -132,9 +132,6 @@
                           (' '.join(self.caps or ['none'])))
         return self.caps
 
-    def lock(self):
-        raise error.Abort(_('operation not supported over http'))
-
     def _callstream(self, cmd, _compressible=False, **args):
         if cmd == 'pushkey':
             args['data'] = ''