How to set the session expiration time in Flask?

In Flask, the expiration time of a session can be set by adjusting the PERMANENT_SESSION_LIFETIME parameter. By default, sessions expire immediately after the browser is closed, but this time can be changed through configuration.

Here are the steps to set the session timeout.

1. In a Flask application, locate the configuration file (typically config.py or app.py).
2. Add the following code to the configuration file to set the session expiration time:

# 设置session的过期时间为30分钟
PERMANENT_SESSION_LIFETIME = timedelta(minutes=30)

1. The permanent session

from flask import session

@app.route('/login', methods=['POST'])
def login():
    # 登录成功后，设置session为永久性
    session['username'] = 'admin'
    session.permanent = True
    return 'Login Success'

By setting the PERMANENT_SESSION_LIFETIME parameter and using the session.permanent attribute, you can specify the expiration time of Flask’s session. Keep in mind that the value of the PERMANENT_SESSION_LIFETIME parameter is a timedelta object and can be adjusted to different time intervals as needed.