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