Install and run in venv:

cd python/starlette
python3 -m venv venv
source venv/bin/activate
pip install -r requirements.txt
pip install -e [/FULL PATH TO DD-TRACE-PY FOLDER]
python app.py

Open http://127.0.0.1:8000/ in your browser:

Navigate to path that is not routed, eg http://127.0.0.1:8000/nope:

Raise a server error by navigating to http://127.0.0.1:8000/error:

Switch the app = Starlette(debug=True) line to app = Starlette() to see a regular 500 page instead.