What the response writer needs to know besides the status and the headers.
Fields
- version: := Version.HTTP_1_1
- reason: string
- empty for the standard phrase of the status
- request_method: := Method.GET
- HEAD responses and CONNECT tunnels carry no body
- keep_alive: := true
- false adds
Connection: close - date: string
- when not empty, sent as the Date header (see Date_Cache)
- server: string
- when not empty, sent as the Server header