Flask – Cookies
A cookie is put away on a customer's PC as a form of text file. Its purpose is to recollect and track information relating to a customer's use for better visitor experience and site statistics.
A Request object contains a cookie's property. It is a word reference object of all the cookie factors and their corresponding values, a customer has transmitted. Notwithstanding it, a cookie additionally stores its expiry time, path and domain name of the site.
In Flask, cookies are determined to reaction object. Use make_response() capacity to get reaction object from return estimation of a view work. From that point onward, utilize the set_cookie() capacity of response object to store a cookie.
Reading back a cookie is simple. The get() strategy for request.cookies attribute is utilized to read a cookie.
In the accompanying Flask application, a simple structure opens up as you visit '/' URL.
@app.route('/') def index(): return render_template('index.html')
This HTML page contains one text input.
<html> <body> <form action = "/setcookie" method = "POST"> <p><h3>Enter userID</h3></p> <p><input type = 'text' name = 'nm'/></p> <p><input type = 'submit' value = 'Login'/></p> </form> </body> </html>
The Form is posted to ‘/setcookie’ URL. The associated view function sets a Cookie name userID and renders another page.
@app.route('/setcookie', methods = ['POST', 'GET']) def setcookie(): if request.method == 'POST': user = request.form['nm'] resp = make_response(render_template('readcookie.html')) resp.set_cookie('userID', user) return resp‘readcookie.html’ contains a hyperlink to another view function getcookie(), which reads back and displays the cookie value in browser.
@app.route('/getcookie') def getcookie(): name = request.cookies.get('userID') return '<h1>welcome '+name+'</h1>'
Run the application and visit http://localhost:5000/
The result of setting a cookie is displayed like this −