Node 18 strip forbidden header(s?) automatically?

[KATT]

See #2085

In order for SSR to work, we need to at a minimum strip the connection header when forwarding the headers from the browser.

• Are there other headers we need to strip than connection?
• Should we do this automatically? Should then then be configurable?

Example how to fix SSR in Node 18 SSR: KATT/unidici-fetch-reserved-header-crap#1

[KATT]

Caveats are in docs now

[github-actions]

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