(09) flask is OK if it has hands - cookies and sessions

zero 、 Preface

This article , Elaborate on Flask in Cookie and Session

1. Why Cookie and Session Well ？
   answer ： because http Request is stateless , How do you understand that ？ When you visit B When standing , If you don't Cookie perhaps Session,B The station thinks you are an unlisted user . If you have Cookie or Session, that B The station will know that you are logged in , And know who you are . So I can return the information related to you
2. The difference between the two ：
   answer ：Cookie It's plain text ,Session It's encrypted. Cookie.

Cookie Use

from flask import Flask, Response, request
app = Flask(__name__)

@app.route("/set_cookie")
def set_cookie():
    response = Response("set cookie success")
    response.set_cookie("user_id","123")
    return response

@app.route("/get_cookie")
def get_cookie():
    cookies = request.cookies
    if cookies.get("user_id") == "123":
        return " Dear users, hello , Yours cookies yes " + str(cookies)
    else:
        return " You are not VIP, Please get your identity first "

if __name__ == "__main__":
    app.run(debug=True,port=5000)

• First visit /home Address , You will find that you have no Cookie Give you back a You are not VIP, Please get your identity first
• But when we first visit /set_cookie, We'll get one cookie, Then we are visiting /home Address , You can successfully display Dear user, hello

Session Use

from flask import Flask, session

app = Flask(__name__)
# ！！！ You need to set up a SECRET_KEY Used to encrypt Cookie
app.config["SECRET_KEY"] = "123"

@app.route("/set_session")
def set_session():
    session["user_name"] = "zhuxiaoxiao"
    return " Set up session success " + session["user_name"]

@app.route("/home")
def home():
    if session.get("user_name") == "zhuxiaoxiao":
        return " Dear users , Login successful "
    else:
        return " Please login first ?"

if __name__ == "__main__":
    app.run(debug=True,port=5000)

• Session The way of use is overall and Cookie It's the same .
• It should be noted that the Session front , It must be set SECRET_KEY, Used to encrypt Cookie