Bug report

If you have a directory called index.html or index.htm within a directory (any name in SimpleHTTPRequestHandler.index_pages), it causes http.server to return a 404 Not Found error instead of the directory listing. This comes about due to not checking that the index is a regular file when it checks for its presence. The 404 error comes from the call to open() the directory raising an OSError.

To reproduce create a folder structure like below and run python3 -m http.server -d foo. You will get a 404 error rather than a directory listing.

Your environment

• CPython versions tested on: 3.11.0, Python 3.12.0a3 (c3c7848)
• Operating system and architecture: Fedora Linux 37 (Workstation Edition) x86_64

Linked PRs

• gh-100474: Fix handling of dirs named index.html in http.server #100475
• [3.10] gh-100474: Fix handling of dirs named index.html in http.server (GH-100504) #100504
• [3.11] gh-100474: Fix handling of dirs named index.html in http.server (GH-100475) #100505