fetchParams, spec here, is used as an input to several http fetch functions, specifically

• https://fetch.spec.whatwg.org/#main-fetch (implementation)
• https://fetch.spec.whatwg.org/#scheme-fetch (implementation)
• https://fetch.spec.whatwg.org/#http-fetch (implementation)
• https://fetch.spec.whatwg.org/#http-redirect-fetch (implementation)
• https://fetch.spec.whatwg.org/#http-network-or-cache-fetch (implementation)
• https://fetch.spec.whatwg.org/#http-network-fetch (implementation)
• https://fetch.spec.whatwg.org/#cors-preflight-fetch (implementation)

Those functions take a plain request as input, but it would be good to replace that with a minimal implementation of fetchParams only because, the full implementation is a bit more complex. The minimal implementation could look like

struct FetchParams {
    pub request: Request
    // Todo: implement rest of FetchParams with a link to the spec and link to this issue
}

I looked into maybe merging FetchContext with FetchParams but they don't share anything in common except for potentially the timing information and cancellation.

This would help with getting #33161 completed and would bring the fetch implementations a little more in line with the spec.

I would like to take on this task.