Web servers can be spun up quickly on the command line but with gotchas. Take the innocent PHP web server cli.
php -S 127.0.0.1:8080 Best not to use PHP’s web server cli (even for PHP) because routes with a dot (.) are assumed to be static files. Use a real web server or superior cli web servers with minor gotchas.
python -m http.server --bind 127.0.0.1 8080 busybox httpd -f -p 127.0.0.1:8080 ruby -run -e httpd . -p 8080