Re: [whatwg/fetch] 421 and upload streams (#982)

Thanks for clarifying that.

I'm not familiar with the spec grammar and writing.
How about rewriting the current spec with
```
If the body is not streaming, clients receiving a 421 (Misdirected Request) response from a server MUSTY retry the request.
If the body is streaming, clients receiving a 421 (Misdirected Request) response from a server MUSTY not retry the request.
```
?
and which spec (rfc7540 or whatwg/fetch) should be updated?


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