--- a/mercurial/httprepo.py	Wed Nov 10 17:28:24 2010 +0100
+++ b/mercurial/httprepo.py	Fri Nov 12 01:21:45 2010 -0600
@@ -68,6 +68,8 @@
         raise util.Abort(_('operation not supported over http'))
 
     def _callstream(self, cmd, **args):
+        if cmd is 'pushkey':
+            args['data'] = ''
         data = args.pop('data', None)
         headers = args.pop('headers', {})
         self.ui.debug("sending %s command\n" % cmd)