Flask is a Python framework for web servers. It's like 5 minutes to a HelloWorld webpage
The time to create a "hello world" page isn't really the best selling point when it can be done in ~15 seconds depending on your internet speed.
yum install -y httpd && echo 'Hello, World.' >/var/www/html/index.html && systemctl start httpd
Or assuming that you want something in python echo 'Hello, World.' > index.html && python -m http.server
I don't even know what a "Flask endpoint" is. Actually I barely know what Webpack and React are either.