Re: [whatwg/fetch] Request body streams that cannot be retried (#538)

@MattMenke2 to give some context. We can only upload "blobs" today and those can easily be replayed. For uploading streams we want a design that's minimal in terms of memory usage. So if you upload 1TiB, it shouldn't also try to buffer 1TiB. Therefore, as OP notes, the plan is to fail on redirects and various other known cases that require a replay. The question is if such replay can always be avoided, reduced to only a fixed 100KiB buffer or so, or result in error, or if uploading streams without also buffering everything is doomed to fail for one reason or another.

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