Response

app.get('/', function (req, res) {
  console.dir(res.headersSent) //false
  res.send('OK')
console.dir(res.headersSent) //true
})

:-	:-
`res.append()`	#
`res.attachment()`	#
`res.cookie()`	#
`res.clearCookie()`	#
`res.download()`	Prompt for files to download #
`res.end()`	end the response process #
`res.format()`	#
`res.get()`	#
`res.json()`	Send JSON response #
`res.jsonp()`	Send a response with JSONP support #
`res.links()`	#
`res.location()`	#
`res.redirect()`	Redirect request #
`res.render()`	render view template #
`res.send()`	Send various types of responses #
`res.sendFile()`	Send a file as an octet stream #
`res.sendStatus()`	#
`res.set()`	#
`res.status()`	#
`res.type()`	#
`res.vary()`	#

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