anchor.diff:  
   [source,javascript]
   ----
  -fetch('/users.json').then((response) => {
  -  console.log('Content-Type', response.headers.get('Content-Type'))
  -  console.log('Date', response.headers.get('Date'))
  -  console.log('status', response.status)
  -  console.log('statusText', response.statusText)
  +fetch('/users.json').then((res) => {
  +  console.log('Content-Type', res.headers.get('Content-Type'))
  +  console.log('Date', res.headers.get('Date'))
  +  console.log('status', res.status)
  +  console.log('statusText', res.statusText)
   })
   ----
   
  
positive.code: [source,javascript]
  ----
  fetch('/users.json')
    .then((response) => {
      return response.json()
    }).then((json) => {
      console.log('success:', json)
    }).catch((ex) => {
  
negative.code: [source,javascript]
  ----
  fetch('/users.html')
    .then((res) => {
      return res.text()
    }).then((body) => {
      document.body.innerHTML = body
    })
  