Cookies

• Passed as HTTP headers
  • Server sends Set-Cookie: name=value
  • Browser sends Cookie: name=value

Uses:

• Authorization
• Shopping carts
• Recommendations
• User session state (web email)

How to keep state:

• Protocol endpoints: Maintain state at sender/receiver over multiple transactions
• Cookies: HTTP messages carry state

Warning

Cookies allow sites to learn stuff like your name and email