test2.lua

local request = require('coro-http').request
local json = require('json')

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

coroutine.wrap(function ()
  local res, resBody = request("POST", "https://identity.api.rackspacecloud.com/v2.0/tokens", {
    {'Content-type', 'application/json'},
    {'Content-length', #body}
  }, body)
  p(resBody)
  p(res)
  p(json.parse(resBody))
  os.exit()
end)()