diff --git a/mercurial/httppeer.py b/mercurial/httppeer.py
--- a/mercurial/httppeer.py
+++ b/mercurial/httppeer.py
@@ -382,7 +382,9 @@ class httppeer(wireprotov1peer.wirepeer)
         self._path = path
         self._url = url
         self._caps = caps
-        self.limitedarguments = caps is not None and 'httppostargs' not in caps
+        self.limitedarguments = False
+        if caps is None or 'batch' not in caps or 'httppostargs' not in caps:
+            self.limitedarguments = True
         self._urlopener = opener
         self._requestbuilder = requestbuilder