--- a/hgext/reviewboard/client.py
+++ b/hgext/reviewboard/client.py
@@ -279,24 +279,32 @@ def wrappedpush(orig, repo, remote, forc
         # the remote below.
         if newurl.host != oldurl.host:
             raise util.Abort(_('refusing to redirect due to URL mismatch: %s' %
                 newurl))
 
         repo.ui.status(_('redirecting push to %s\n') % newurl)
 
         if isinstance(remote, httppeer.httppeer):
+            # TRACKING various attributes renamed in Mercurial 4.4.
             remote._url = str(newurl)
 
             newurl.user = oldurl.user
             newurl.passwd = oldurl.passwd
-            remote.path = str(newurl)
+
+            if util.safehasattr(remote, '_path'):
+                remote._path = str(newurl)
+            else:
+                remote.path = str(newurl)
 
             # Wipe out cached capabilities.
-            remote.caps = None
+            if util.safehasattr(remote, '_caps'):
+                remote._caps = None
+            else:
+                remote.caps = None
 
             newremote = remote
 
         elif isinstance(remote, sshpeer.sshpeer):
             newurl.user = oldurl.user
 
             # SSH remotes establish processes. We can't simply monkeypatch
             # the instance.