| 1 |
tools.ietf.org/html/rfc2119
rfc2119Key words for use in RFCs to Indicate Requirement Levels (RFC ) |
| 2 |
tools.ietf.org/html/rfc2142
rfc2142Mailbox Names for Common Services_Roles and Functions (RFC ) |
| 3 |
tools.ietf.org/html/rfc2109
rfc 2109 - http state management mechanism |