[whatwg/fetch] Only allow blob: URLs that have a backing blob (PR #1435)

Document the need to return a network error on fetch if the blob URL has
no backing blob.

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You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/1435


-- Commit Summary --

  * Only allow blob: URLs that have a backing blob

-- File Changes --

    M fetch.bs (5)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1435.patch

https://github.com/whatwg/fetch/pull/1435.diff


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