gistfile1

var data = querystring.stringify({'file_ext[gistfile1]': opt.ext, 'file_name[gistfile1]': opt.file, 'file_contents[gistfile1]': contents })

var request = client.request('POST', '/gists', {
  'Host': 'gist.github.com',
  'Content-Type': 'application/x-www-form-urlencoded',
  'Content-Length': data.length
})

request.end(data)

request.on('response', function(res) {
  res.on('end', function() {
    console.log(res.headers.location)
  })
})