Python Flask 中的浏览器缓存问题
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Browser caching issues in flask
提问by The Internet
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?
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，我仍然会看到我以第一个用户身份登录的页面。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？
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。
Here is some of my code. I was using flask-login but I then tried to "roll my own"
这是我的一些代码。我正在使用烧瓶登录，但后来我尝试“推出我自己的”
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)
采纳答案by The Internet
Setting the cache to be max-age=0 fixed it.
将缓存设置为 max-age=0 修复了它。
@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
回答by cowls
To stop browser caching on these sort of pages you need to set some HTTP response headers.
要停止浏览器缓存此类页面，您需要设置一些 HTTP 响应标头。
Cache-Control: no-cache, no-store
Pragma: no-cache
Once you do this then the browser wont cache those pages. I dont know how to do this with "flask" so I will leave that as an exercise for you :)
执行此操作后，浏览器将不会缓存这些页面。我不知道如何用“烧瓶”来做到这一点，所以我将把它留给你作为练习:)
This question shows how to add a response header Flask/Werkzeug how to attach HTTP content-length header to file download
这个问题展示了如何添加响应头Flask/Werkzeug 如何将 HTTP 内容长度头附加到文件下载
