An HTTP cookie (such as a web cookie or browser cookie) is a very simple dictionary/key-value store that a server can send to the client. It is sent by the server using the Set-Cookie header. For example, a Set-Cookie header may look like this:
Set-Cookie: <cookie-name>=<cookie-value>; Domain=<domain-value>; Expires=<date>
Multiple Set-Cookie headers can be sent in the same response message to compose the key-value store.
What's special about cookies is the fact that most browser clients will automatically send this key-value store back with each subsequent request, this time inside a Cookie header:
Cookie: name1=value1; name2=value2
Therefore, if we use a cookie to store the user's session ID in the browser, it'll allow the ...
