The date and time that the message was sent.

date

server

Recommends the preferred rendering engine (often a backward-compatibility mode) to use to display the content.

The natural language or languages of the intended audience for the enclosed content.

Prevents Internet Explorer from MIME-sniffing a response away from the declared content-type.

Block requests if type 'style' or 'script'.

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 would like to keep the connection open.

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

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

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

The time at which the response is considered stale.

Indicates that different content may be provided to different clients, depending on the vary header.

The last modified date for the requested object.

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.