[farkin88]

Undici is solid. Being the engine behind Node's fetch is huge. The performance gains are real and having it baked into core means no more dependency debates. Plus, it's got some great advanced features (connection pooling, streams) if you need to drop down from the fetch API. Best of both worlds.

[forty]

It's into core but not exposed to users directly. you still need to install the npm module if you want to use it, which is required if you need for example to go through an outgoing proxy in your production environment