Relative URLs don't work as baseURL in 0.20 (browser)

Describe the bug

On 0.19, I used to set baseURL to a relative URL like this:

axios.defaults.baseURL = '/api'

This would append /api to the current window.location.host, like this:

axios.get("/contracts/1/invoices") // GET https://{window.location.host}/api/contracts/1/invoices

On 0.20, setting baseURL like this has no effect. This occurs in all major browsers.

To Reproduce

axios.defaults.baseURL = '/images';
axios.get("/cat.jpg");

Run this in a browser

Expected behavior

GET {protocol}://{window.location.host}/images/cat.jpg

Environment

• axios 0.20.0
• All major browsers

Additional context/Screenshots

N/A

[tenkiller]

@Djunnni

as you know, defaults baseURL need protocol and address where to request

That is incorrect. A URL with no protocol or host is a relative URL. This is a pretty basic understanding of how the Web works. And, it is indeed supported in Axios.

[chinesedfan]

Failed to reproduce. Did I miss something? And what request url did you see in fact?

If deployed in local, the following test.html sends a request to http://127.0.0.1:8080/images/cat.jpg.

<!-- the CDN points to 0.20.0 -->
<script src="https://unpkg.com/axios/dist/axios.min.js"></script>
<script type="text/javascript">
    axios.defaults.baseURL = '/images';
    axios.get("/cat.jpg");
</script>