Re: [whatwg/fetch] 301/302/303 Redirect does not preserve headers (Issue #1711)

Looking closer, is the issue a misinterpretation of `request-body-header name`?  It appears that this is a strict set of headers:
```
A request-body-header name is a [header name](https://fetch.spec.whatwg.org/#header-name) that is a [byte-case-insensitive](https://infra.spec.whatwg.org/#byte-case-insensitive) match for one of:

`Content-Encoding`
`Content-Language`
`Content-Location`
`Content-Type`
```
and not all headers.

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