* https://fetch.spec.whatwg.org/#garbage-collection

The [Fetch Standard](https://fetch.spec.whatwg.org) allows users to skip consuming the response body by relying on

[garbage collection](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Memory_Management#garbage_collection) to release connection resources.

Garbage collection in Node is less aggressive and deterministic

(due to the lack of clear idle periods that browsers have through the rendering refresh rate)

which means that leaving the release of connection resources to the garbage collector can lead

to excessive connection usage, reduced performance (due to less connection re-use), and even

stalls or deadlocks when running out of connections.

Therefore, __it is important to always either consume or cancel the response body anyway__.

const { headers } = await fetch(url);

However, if you want to get only headers, it might be better to use `HEAD` request method. Usage of this method will obviate the need for consumption or cancelling of the response body. See [MDN - HTTP - HTTP request methods - HEAD](https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/HEAD) for more details.

const headers = await fetch(url, { method: 'HEAD' })

.then(res => res.headers)

Note that consuming the response body is _mandatory_ for `request`:

const { body, headers } = await request(url);

const { headers } = await request(url);

* https://fetch.spec.whatwg.org/#cors-safelisted-response-header-name