Quick introduction to cookies and simple code examples in Python development, pythoncookie

Quick introduction to cookies and simple code examples in Python development, pythoncookie

Cookie: a key-Value Pair stored in the user's browser to solve the stateless connection of http. The server can write the cookie to the user's browser. Each request is sent with a cookie.

Storage location:

Each request cookie is placed in the request header.

Application scenarios:

· Remember the password for login users and passwords
· The data displayed on each page will be displayed in the future according to the set quantity
· Voting mechanism

Case User Login create user login url

url(r'^login/', views.login),

Create logon page

Code:

<! DOCTYPE html> Background function Creation Method

Code:
def login(request):  if request.method == "GET":    return render(request,'houtaiguanli/login.html')  else:    user = request.POST.get('username')    pwd = request.POST.get('password')    if user == 'ke' and pwd == '123':      obj = redirect('/classes/')      obj.set_cookie('ticket','dafadfafaf')      return obj    else:      return render(request,'houtaiguanli/login.html')
After successful login, you can access the class page normally, that is, "classes". Therefore, make a judgment on the class method. If it is determined that the user has logged on, it can be accessed normally. Determine that the user is not logged on normally, so that it will jump to the logon page to continue logging on

The cookie is set and sent to the user's browser. The browser carries cookies when making new requests.
Set_cookies syntax Set-cookie: name = name; expires = date; path = path; domain = domain; secure name = name: the cookie value needs to be Set (name cannot use "; "and", "), separated by"; ", for example, name1 = name1; name2 = name2; name3 = name3. Expires = date: cookie validity period. Format: expires = "Wdy, DD-Mon-yyyy hh: MM: SS" path = path: set the path supported by cookies, if path is a path, the cookie takes effect for all files and subdirectories in this directory, for example, path = "/cgi-bin/". If path is a file, cookie is effective for this file, for example, path = "/cgi-bin/cookie. cgi ". Domain = domain: the domain name that takes effect for the cookie. For example, domain = "gzdz42451.net" secure: If this flag is provided, the cookie can only be transmitted through the https server of the SSL protocol. Cookie receiving is implemented by setting the environment variable HTTP_COOKIE. The CGI program can retrieve the cookie information by searching the variable.
Cookies can also be encrypted.

Add salt

Decryption when the backend is taken
Browser View

Summary
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