diff -r 8accf5fa9930 -r 6ff1a0d109c9 mercurial/hgweb/common.py
--- a/mercurial/hgweb/common.py	Sat Nov 30 02:38:42 2019 -0500
+++ b/mercurial/hgweb/common.py	Sat Nov 30 02:53:39 2019 -0500
@@ -193,7 +193,7 @@
         return
 
     fpath = os.path.join(*fname.split(b'/'))
-    if isinstance(directory, str):
+    if isinstance(directory, bytes):
         directory = [directory]
     for d in directory:
         path = os.path.join(d, fpath)