old_contents: const data = {
    body: {
      response: '',
      responseText: '',
      responseType: 'text',
      status: 200,
      statusText: 'OK'
    },
    headers: {
      'content-type': 'type/text',
      'content-length': 1234
    }
  }
  
  export default data
  
new_contents: const data = {
    expires: 0,
    data: {
      body: {
        response: '',
        responseText: '',
        responseType: 'text',
        status: 200,
        statusText: 'OK'
      },
      headers: 'content-type: type/text\ncontent-length: 1234'
    }
  }
  
  export default data
  
subject: update to new format