Comparison to other AJAX libraries/solutions

Explanations on why this library was made despite there being many libraries already out there.

Why not use fetch?

Fetch is sometimes cumbersome:

Must set Content-Type header and encode body manually when sending JSON
Must call response.json() always when retrieving JSON
Forces proper CORS always
Does not reject on 4xx or 5xx responses status codes, only on network errors

Why not use axios?

Axios has a history of issues related to global defaults and side-effects (some severe). Some have been fixed but more still arise.

It is cumbersome and error-prone to set request configuration with a (nested) object. Also, this design sometimes leads to cumbersome workarounds (e.g. unsetting a header value).

Why not use jQuery.ajax?

If you have it in your project, sure. Not that common anymore.

Worth noting that older versions of jQuery, still widely in use, implement a broken Promise implementation.

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