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doc: add fetch implementation differences #63878

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12 changes: 12 additions & 0 deletions doc/api/globals.md
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Expand Up @@ -567,6 +567,18 @@ The implementation is based upon [undici](https://undici.nodejs.org), an HTTP/1.
written from scratch for Node.js. You can figure out which version of `undici` is bundled
in your Node.js process reading the `process.versions.undici` property.

### Differences from browser `fetch()`

The Node.js implementation of `fetch()` is browser-compatible but is
implemented by undici. Some browser-specific behaviors do not apply in Node.js.

Known differences include:

* Browser-specific forbidden header restrictions are not applied, although
lower-level HTTP constraints still apply.
* Cookies are not automatically stored or sent between requests.
* `AsyncIterable` instances can be used as `Request` or `Response` bodies.

### Custom dispatcher

You can use a custom dispatcher to dispatch requests passing it in fetch's options object.
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