Python 3.14 gives absolute paths an empty authority, so pathname2url("/tmp")
returns "///tmp" rather than "/tmp". fs appends that to a protocol prefix that
already ends in "//", producing URLs like "osfs://///tmp/foo".

https://github.com/PyFilesystem/pyfilesystem2/issues/596

--- a/fs/_url_tools.py
+++ b/fs/_url_tools.py
@@ -3,6 +3,7 @@
 import platform
 import re
 import six
+import sys
 
 if typing.TYPE_CHECKING:
     from typing import Text
@@ -10,6 +11,17 @@
 _WINDOWS_PLATFORM = platform.system() == "Windows"
 
 
+def _pathname2url(path):
+    # type: (Text) -> Text
+    """Convert a path to a URL path, as Python < 3.14 used to."""
+    url = six.moves.urllib.request.pathname2url(path)
+    # Python 3.14 gives absolute paths an empty authority, so that the
+    # result can be appended to "file:" rather than to "file://".
+    if sys.version_info >= (3, 14) and url.startswith("///"):
+        url = url[2:]
+    return url
+
+
 def url_quote(path_snippet):
     # type: (Text) -> Text
     """Quote a URL without quoting the Windows drive letter, if any.
@@ -26,12 +38,12 @@
         drive_letter, path = path_snippet.split(":", 1)
         if six.PY2:
             path = path.encode("utf-8")
-        path = six.moves.urllib.request.pathname2url(path)
+        path = _pathname2url(path)
         path_snippet = "{}:{}".format(drive_letter, path)
     else:
         if six.PY2:
             path_snippet = path_snippet.encode("utf-8")
-        path_snippet = six.moves.urllib.request.pathname2url(path_snippet)
+        path_snippet = _pathname2url(path_snippet)
     return path_snippet