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. [STANDARDS-TRACK]| IETF Datatracker
Research on how browsers encode & send cookies, how they are parsed by various web frameworks, and some bugs| arxenix's blog