The date and time that the message was sent.

date

server

The time at which the response is considered stale.

Inform all caching mechanisms from server to client whether they may cache this object.

May be stored by any cache but must be validated by the server.

The time a browser should remember a site can only be accessed with https (seconds).

WordPress redirect agent.  A value of "WordPress" indicates that WordPress itself redirected the resource.

Control options for the current connection and list of hop-by-hop response fields.

The client or server would like to close the connection.

This and all future requests should be directed to the given URI. The request method can change.

Used to express a typed relationship with another resource.

Standard response indicating a successful action. For GET requests this will be the resource, and for POST it will be the result of the action.