Rewrite Curl to LUA?

[admin]

Code:

http = require('socket.http')
ltn12 = require('ltn12')
json = require('json')

function dorequest(url, headers, data)
  local resp = {}

  headers['Content-Length'] = #data

  local res, err = http.request({
    url = url,
    method = 'POST',
    headers = headers,
    sink = ltn12.sink.table(resp),
    source = ltn12.source.string(data)
  })

  if res then
    return table.concat(resp)
  else
    return nil, err
  end
end

url = 'http://api.kairos.com/detect'
imageurl = 'http://...'
app_id = 'YOUR_APP_ID'
app_key = 'YOUR_APP_KEY'

headers = {
  ['Content-Type'] = 'application/json',
  ['app_id'] = app_id,
  ['app_key'] = app_key,
}

data = json.encode({
  ['image'] = imageurl
})

res, err = dorequest(url, headers, data)
log(res, err)