RFC ( Request for Comments ) 2109, February 1997. This document specifies a way to create a stateful session with HTTP
requests and responses. It describes two new headers, Cookie and
Set-Cookie, which carry state information between participating
origin servers and user agents. The method described here differs
from Netscape's Cookie proposal, but it can interoperate with
HTTP/1.0 user agents that use Netscape's method. This document was obsoleted by RFC 2965.