How can I ensure that Flask session variable remains persistent even when multiple requests are made?

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To ensure that Flask session variable remains persistent even when multiple requests are made, you can use a server-side session store like Redis or Memcached. These datastore systems allow session data to be stored and retrieved quickly and efficiently, making it easy to maintain session state across multiple HTTP requests.

To use a server-side session store in Flask, you can use one of the available Flask session extensions such as Flask-Session. These extensions provide an easy way to configure a server-side session store and manage session data in your Flask app.

Here's an example of how to use the Flask-Session extension to configure a Redis session store:

from flask import Flask
from flask_session import Session

app = Flask(__name__)

# Configure the Redis session store
app.config['SESSION_TYPE'] = 'redis'
app.config['SESSION_REDIS'] = redis.from_url('REDIS_URL_HERE')

# Initialize the Flask-Session extension
Session(app)

# Use the session in your Flask routes
@app.route('/')
def index():
    session['user_id'] = 123
    return 'Session variable set!'

With this configuration, the session variable user_id will be persisted in the Redis datastore and can be accessed in subsequent requests.