test.lua

local https = require('https')
local json = require('json')

local body = json.stringify({
  ['auth'] = {
    ['RAX-KSKEY:apiKeyCredentials'] = {
      ['username'] = '',
      ['apiKey'] = '',
    }
  }
})

local req = https.request({
  host = "identity.api.rackspacecloud.com",
  port = 443,
  path = "/v2.0/tokens",
  method = 'POST',
  headers = {
    {'Content-type', 'application/json'},
    {'Content-length', #body},
  },
}, function(res)
  res:on('data', p)
  res:on('end', function() p('end') end)
end)
req:write(body)
req:done()