Section/Content To Improve
Config defaults

Suggested Improvement
The documentation teases with a concept of common when setting default header values:

axios.defaults.headers.common['Authorization'] = AUTH_TOKEN;
axios.defaults.headers.post['Content-Type'] = 'application/x-www-form-urlencoded';

Presumably, that means for all request methods, but (playing devil's advocate here) maybe it's demonstrating that you can set default headers for custom request methods (like if your server accepts a custom request method of common).

Is common actually a keyword that means any request method?

Are there other keywords with special meaning? Like, for example, one that applies only to requests containing a payload?

Does any other non-keyword value apply to a method value? Even custom methods?

Is it possible to set a default header for requests to my server that understands common as a custom HTTP method?

If I set a common header and a get header, does get override common?

Is there a simple way to apply a header to requests of every method type except one?

axios.defaults.headers.common['Content-Type'] = 'application/json';
axios.defaults.headers.get['Content-Type'] = null;

What effect will that have?

Some of my questions are hypothetical. Forgive me.

Relevant File(s): README.md