interface AjaxRequest {
      url?: string
      body?: any
      user?: string
      async?: boolean
      method?: string
      headers?: Object
      timeout?: number
      password?: string
      hasContent?: boolean
      crossDomain?: boolean
      withCredentials?: boolean
      createXHR?: () => XMLHttpRequest
      progressSubscriber?: Subscriber<any>
      responseType?: string
    }

物产