flask_visit_counter.py

from flask import Flask, request, make_response

app = Flask(__name__)

@app.route('/')
def visit_counter():
    visits = int(getattr(request.cookies, 'visits', 0)) + 1

    msg = f'''
      <h1>
        {visits} visita{"s" if visits > 2 else ""}
      </h1>
    '''

    res = make_response(msg)
    res.set_cookie('visits', str(visits))
    return res

@app.route('/reset')
def reset_counter():
    res = make_response('Resetting... ok')
    res.set_cookie('visits', '0', 0)
    return res

if __name__ == "__main__":
    app.run(host='0.0.0.0', port=4000)