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

The client would like to keep the connection open.

connection

keep-alive

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.

The date and time that the message was sent.

Indicate a resource should be loaded from a different server while still appearing to be loaded from this server.

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.

The resource could not be found, but may be available in the future.