differenet behaviours between localhost and github

[Freed-Wu]

I create a blog by jekyll. However, the _site built by jekyll has different behaviours between localhost and github.

git clone --branch=gh-pages https://github.com/Freed-Wu/Freed-Wu.github.io _site
python -m http.server -d _site

xdg-open http://localhost:8000/2023/

The web page exists. _site/sitemap.xml contains the url, too.

However, in github,

xdg-open https://Freed-Wu.github.io/2023/

The web page doesn't exist.

wget https://Freed-Wu.github.io/sitemap.xml doesn't contain the url.

What happened?

[ashmaroli]

The reason behind this is that you have set up GitHub Pages settings incorrectly.
You have correctly set up GitHub Actions to build your site with Jekyll 4 and upload it to the gh-pages branch. But unfortunately because of incorrect GitHub settings, GitHub rebuilds the site using Jekyll 3.9 (classic GitHub Pages) and deploys that to your domain.
This can be confirmed by View Page Source of your homepage. You will see <meta name="generator" content="Jekyll v3.9.3" />