Python Set-Cookie

Set-Cookie: name=steve; Domain=www.rddit.com; Path=/

domain is restricted wwww.

Third party set cookie such as google analytics
ad network also set cookie

Set-Cookie: user=123; Expire= Ture, 1 Jan
"session" cookie = no Expire

session cookie delete when close the browser.

def get(self):
        self.response.headers['Content-Type'] = 'text/plain'
        visits = self.request.cookies.get('visits', 0)
        if visits.isdigit();
            visits = int(visits) + 1
        else:
            visits = 0
        self.response.headers.add_header('Set-Cookie', 'visits=%s' % visits)
        if visits > 100:
            self.write("you are the best ever")
        else:
            self.write("you've been here %s times!" % visits)

write document.cookie in console.
we can rewrite cookie.

document.cookie
"wordpress_test_cookie=WP+Cookie+check; wp-settings-1=editor%3Dhtml%26libraryContent%3Dbrowse%26imgsize%3Dmedium; wp-settings-time-1=1482994300; _ga=GA1.2.511761152.1479929467"
document.cookie="wp-settings-tims-1=1482994301"
"wp-settings-tims-1=1482994301"