Regression in 0.19.0: file:/// that always returns a status code 0 now returns an error

[gierschv]

Describe the bug

Since I upgrade axios from 0.18.0 to 0.19.0, the requests made to fetch a local file (file:///) with a relative path return an error: Request failed with status code 0. However the web browser will always return a status code 0 when the request success because there is no HTTP server involved. The XHR readyState is also 4, if there was a network error, I believe this one would probably be 0 as well.

To Reproduce

// In a HTML file like opened at file:///tmp/axios.html for example
axios.get('./file.ttf', {
  responseType: 'arraybuffer',
}).then((resp) => {
  console.log('OK', resp);
}).catch((err) => {
  if (err.request && err.request.readyState === 4) {
     //  The response here should not be treated as an error
  }
  console.log('ERR', err);
});

Expected behavior
The request should success and return the arraybuffer (works with axios 0.18.0).

Environment:

• Axios Version: 0.19.0
• OS: iOS 12.4, OSX 10.14.6
• Browser: Safari
• Browser Version: 12.1.2
• Additional Library Versions: None

Additional context/Screenshots