from flask import Flask, request, make_response, redirect

app = Flask(__name__)

@app.route('/')
def index():
    user_ip = request.remote_addr
    response = make_response(redirect('/hello/'))
    response.set_cookie('user_ip', user_ip)
    return response

@app.route('/hello/')
def hello():
    user_ip = request.cookies.get('user_ip')
    return 'Hello world from Flask, tu ip es {}'.format(user_ip)