Maybe a bug in isURLSameOrigin function?

[ghost]

Describe the bug

There is probably a bug in

axios/lib/helpers/isURLSameOrigin.js

Line 56 in 7d6bddb

var parsed = (utils.isString(requestURL)) ? resolveURL(requestURL) : requestURL;

If you pass undefined, the parsed variable becomes undefined and then you try to access parsed.protocol. Of course I wouldn't pass undefined intentionally, but if I have some config object and property is missing, then you get this unexpected behavior in browser.

To Reproduce

const someConfigObject = {};
const opts = { url: someConfigObject.accidentallyNotExistingProperty };
axios(opts).then(response => console.log(response)).catch(e => console.log(e));

Expected behavior

At least error message saying that the url should be string, not undefined.

Environment

• Axios Version: 0.21.4 (via https://cdn.jsdelivr.net/npm/axios/dist/axios.min.js)
• Browser: Firefox
• Browser Version 92.0.1

Additional context/Screenshots

...

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