Hello flask application

hello-flask.py

from flask import Flask
app = Flask(__name__)
@app.route("/")
def hello_flask():
  return "Hello world"
app.run(host="0.0.0.0", port=8090)

ngrok-demo.sh

cd /tmp
echo "Getting a python server up"
curl -O https://gist.githubusercontent.com/gabber12/8109d10ba732ac380502135489b28c97/raw/0daa654e9f4e9ae16de2bf396b005a70ebc71240/hello-flask.py
virtualenv venv
source venv/bin/activate
pip install flask
python hello-flask.py &
PID=$!

echo "Getting ngrok started"
linux="linux"
mac="mac"
port=8090
if [ "$1" == "$linux" ]
then
        curl -O https://bin.equinox.io/c/4VmDzA7iaHb/ngrok-stable-linux-amd64.zip
unzip ngrok-stable-linux-amd64.zip
./ngrok http $port
fi
if [ "$1" == "$mac" ]
then
        curl -O https://bin.equinox.io/c/4VmDzA7iaHb/ngrok-stable-darwin-amd64.zip
unzip ngrok-stable-darwin-amd64.zip
./ngrok http $port
fi
rm -rf venv
kill $PID