The multipart upload complete endpoint returns 200 with an empty body,
but rclone tried to decode that body as JSON, failed with EOF and
retried until the retries ran out, so every upload failed even though
the server had actually completed it.
Fixed by not attempting to decode the response body.
This was a regression introduced in
a4972de505 shade: retry server errors instead of failing the transfer
which started treating the JSON decode error as fatal where previously
it was accidentally ignored.
The pacer callbacks only retried 429 responses, so transient server
errors like 502 Bad Gateway failed transfers immediately. Retry the
standard retryable status codes and transport errors everywhere, make
chunk upload retries resend the whole chunk, and fix a potential nil
pointer dereference when logging a bad token response.
Nick Craig-Wood
jhasse-shade