[flask introduction series] cookies and session

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• Series column ：flask Framework quick start
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Preface

Today I would like to sum up flask Medium cookie And session,flask Medium session And normal session It's different , For browsers session, Save in browser .

cookie

1. Set up cookie

# Import Flask Classes and request object 
from flask import Flask,make_response
app = Flask(__name__)

#  The default configuration loaded from the configuration object 
class DefaultConfig(object):
    SECRET_KEY = 'jstwn63bng'
    DEBUG = True
    ENV = 'development'

app.config.from_object(DefaultConfig)

@app.route('/cookie')
def cookie():
    resp = make_response(" Set up cookie")
    resp.set_cookie("aniu","handsome")
    return resp

# Flask Application's run Method start up web The server 
if __name__ == '__main__':
    app.run(port=8000)

2. Set up cookie The period of validity

@app.route('/cookie')
def cookie():
    resp = make_response(" Set up cookie")
    resp.set_cookie("aniu","handsome",max_age=4000)  #max_age Is the number of milliseconds of the maximum expiration time 
    return resp

3. obtain cookie

# Import Flask Classes and request object 
from flask import Flask,make_response,request
app = Flask(__name__)

#  The default configuration loaded from the configuration object 
class DefaultConfig(object):
    SECRET_KEY = 'jstwn63bng'
    DEBUG = True
    ENV = 'development'

app.config.from_object(DefaultConfig)

# Set up cookie
@app.route('/set_cookie')
def set_cookie():
    resp = make_response(" Set up cookie")
    resp.set_cookie("aniu","handsome")
    return resp


# obtain cookie
@app.route('/get_cookie')
def get_cookie():
    resp = request.cookies.get('aniu')
    return resp

# Flask Application's run Method start up web The server 
if __name__ == '__main__':
    app.run(port=5000)

4. Delete cookie

@app.route('/delete_cookie')
def delete_cookie():
    resp = make_response(" Set up cookie")
    resp.delete_cookie("aniu","handsome")
    return resp

session

Be careful ： You have to set it SECRET_KEY, Why? ？ We said in the preface ,flask Medium session It's a browser session, Save in browser , So you need a key .

# Import Flask Classes and request object 
from flask import Flask,session
app = Flask(__name__)

#  The default configuration loaded from the configuration object 
class DefaultConfig(object):
    SECRET_KEY = 'jstwn63bng'
    DEBUG = True
    ENV = 'development'

app.config.from_object(DefaultConfig)

# Set up session
@app.route('/set_session')
def set_session():
    session['username'] = 'aniu'
    return 'set session ok'

# Read 
@app.route('/get_session')
def get_session():
    username = session.get('username')
    return 'get session username {}'.format(username)

reflection ：flask take session Where did you save it ？

stay django in , about session The preservation of the , There will be a special table in the database to save session data , And we flask Medium session It was said that , It's actually a browser session, He saves it in the browser .
> therefore , There will be security problems after putting it in the browser , Therefore, we must add one “ Signature ”, Only myself “ Signature ” Talent , You can't use it after taking it and modifying it . How can I guarantee that this signature is mine , Can't live without our SECRET_KEY 了 . So what you see session The content in can be said to be “ Be encrypted ” 了 .

Conclusion

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