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).

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

Indicate the connection should be upgraded from HTTP to HTTPS.

The client or server would like to close the connection.

A HSTS Policy informing the HTTP client how long to cache the HTTPS only policy and whether this applies to subdomains.

The content security policy allows the server to determine what resources the user is allowed to load.

Define sources for object, embed, and applet elements.

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.