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This PR adds simple retry logic when SDK downloads fail due to an I/O error, to better handle unexpected connection issues during downloads.
We may want to add additional logic in the future (to retry for instance HTTP 429 and HTTP 503 responses), or limit the I/O error retries to just connection resets or unexpected EOF. I've also only allowed one retry after 1 second, which we may also want to increase.
The
bullet_stream
crate was bumped to0.3.0
to leverage schneems/bullet_stream#10.