docs: function apply_data(query, files) {
    if(startCb){
      startCb();
    }
    if (query !== undefined) {
      if (this.method === 'get') {
        this.request = this.request.query(query)
      } else {
        this.request = this.request.send(query)
      }
    }
  
    if (files !== undefined) {
      if (files instanceof FormData) {
        this.request = this.request.send(files)
      } else {
        Object.keys(files).forEach((key) => {
          this.request = this.request.attach(key, files[key])
        })
      }
    }
  }