diff -r f30ce3558c2b -r 35b274cba81d mercurial/httppeer.py
--- a/mercurial/httppeer.py	Thu Feb 02 17:27:50 2023 +0100
+++ b/mercurial/httppeer.py	Thu Feb 02 17:27:58 2023 +0100
@@ -65,7 +65,7 @@
 class _multifile:
     def __init__(self, *fileobjs):
         for f in fileobjs:
-            if not util.safehasattr(f, b'length'):
+            if not util.safehasattr(f, 'length'):
                 raise ValueError(
                     b'_multifile only supports file objects that '
                     b'have a length but this one does not:',