xhr.onreadystatechange = () => {
      if (xhr.readyState !== 4) return

      // IE can throw an error when accessing the status
      let status = 0
      try { status = xhr.status }
      catch (e) {}

      if (status === 0)
        return resolve(Err<AjaxError>({ type: 'networkError' }))

      if (!isOkStatus(status))
        return resolve(Err<AjaxError>({ type: 'badResponse', code: status, response: xhr.responseText }))

      let responseBody
      try { responseBody = JSON.parse(xhr.responseText) }
      catch (e) { return resolve(Err<AjaxError>({
        type: 'badPayload',
        payload: xhr.responseText,
        validationErrors: []
      })) }

      const validated = validator.validate(responseBody)

      if (validated.isOk())
        resolve(validated as Ok<never, V>)
      else
        resolve(Err<AjaxError>({
          type: 'badPayload',
          payload: responseBody,
          validationErrors: validated.get()
        }))
    }

 .then((response: Instagram.Response) => {
   if (response.meta.code === 400) {
     return Err({
       message: response.meta.error_message,
       info: `URL: ${url}`,
     })
   }
   cache.set(key, response.data, 22)
   return Ok(response.data)
 })

 xhr.abort = function() {
   xhr.onreadystatechange = null!
   abortXhr()
   resolve(Err<AjaxError>({ type: 'aborted' }))
 }

 .catch(error => Err<AjaxError>({ type: 'technicalError', error }))