Flask 中的浏览器缓存问题 [英] Browser caching issues in flask

问题描述

我使用flask(www.csppdb.com)建立了一个网站.有时，当我以一个用户身份登录，注销，然后以另一个用户身份登录时，我仍然会看到来自我登录的第一个用户的页面.刷新页面后，此问题立即得到修复.如果我没记错的话，我认为这被称为缓存".有什么方法可以在站点范围内禁用它，以便访问的每个页面都需要新的刷新?

I have built a website using flask (www.csppdb.com). Sometimes when I log in as one user, log out, then login as another user I still see pages from the first user I logged in as. This problem is immediately fixed when the page is refreshed. I think this is called "caching" if I am not mistaken. Is there any way I could disable this on a site wide level so that every page that is visited needs a new refresh?

这就像与朋友共享您的计算机.他登录 Facebook，然后退出.现在你登录他的电脑，你会看到他的个人资料......(尴尬).刷新页面后问题就解决了.

It would be like sharing your computer with a friend. He logs into Facebook, then logs out. Now you log in on his computer and you see his profile... (awkward). After you refresh the page the problem is fixed.

这是我的一些代码.我正在使用烧瓶登录，但后来我尝试自己动手"

Here is some of my code. I was using flask-login but I then tried to "roll my own"

from flask.ext.mysql import MySQL
import os
from flask import Flask, request, jsonify, session, url_for, redirect, 
     render_template, g, flash
from data import *
from werkzeug import check_password_hash, generate_password_hash
import config

app = Flask(__name__)
mysql = MySQL()

app.config['MYSQL_DATABASE_HOST'] = os.environ['MYSQL_DATABASE_HOST'] if 'MYSQL_DATABASE_HOST' in os.environ else config.MYSQL_DATABASE_HOST
app.config['MYSQL_DATABASE_PORT'] = os.environ['MYSQL_DATABASE_PORT'] if 'MYSQL_DATABASE_PORT' in os.environ else config.MYSQL_DATABASE_PORT
app.config['MYSQL_DATABASE_USER'] = os.environ['MYSQL_DATABASE_USER'] if 'MYSQL_DATABASE_USER' in os.environ else config.MYSQL_DATABASE_USER
app.config['MYSQL_DATABASE_PASSWORD'] = os.environ['MYSQL_DATABASE_PASSWORD'] if 'MYSQL_DATABASE_PASSWORD' in os.environ else config.MYSQL_DATABASE_PASSWORD
app.config['MYSQL_DATABASE_DB'] = os.environ['MYSQL_DATABASE_DB'] if 'MYSQL_DATABASE_DB' in os.environ else config.MYSQL_DATABASE_DB

mysql.init_app(app)

if 'SECRET_KEY' in os.environ: app.config['SECRET_KEY'] = os.environ['SECRET_KEY']
else: app.config['SECRET_KEY'] = os.urandom(24)

def connect_db(): return mysql.connect()

def check_auth():
    g.user = None
    if 'username' in session:
        g.user = get_user(session['username'])
        return
    return redirect(url_for('login'))

@app.route('/')
def home(): 
    if 'username' in session: return redirect(url_for('main'))
    return render_template('home.html')

def connect_db(): return mysql.connect()

@app.teardown_request
def teardown_request(exception):
    if exception: print exception
    g.db.close()

@app.before_request
def before_request():
    print session.keys(), session.values()
    print("before request")
    print ('username' in session, "in session?")
    g.db = connect_db()
    g.user = None
    if "username" in session:
        g.user = get_user(session['username'])


@app.route('/login/', methods=['GET', 'POST'])
def login():
    """Logs the user in."""
    if 'username' in session:
        return redirect(url_for('main'))

    error = None
    if request.method == 'POST':
        print("login hit")
        user = get_user(request.form['username'])
        if user is None:
            error = 'Invalid username'
            print error
        elif not check_password_hash(user.password, request.form['password']):
            error = 'Invalid password'
            print error
        else:
            flash('You were logged in')
            print "logged in"
            session['username'] = request.form['username']
            g.user = request.form['username']
            print error, "error"
            return redirect(url_for('main'))

    return render_template('login.html', error=error)

推荐答案

将缓存设置为 max-age=0 修复了它.

Setting the cache to be max-age=0 fixed it.

@app.after_request
def add_header(response):
    """
    Add headers to both force latest IE rendering engine or Chrome Frame,
    and also to cache the rendered page for 10 minutes.
    """
    response.headers['X-UA-Compatible'] = 'IE=Edge,chrome=1'
    response.headers['Cache-Control'] = 'public, max-age=0'
    return response

这篇关于Flask 中的浏览器缓存问题的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！