No point uploading large files 20 times when they're guaranteed to fail each time. We send a 400 response in this case, but send 400's for other errors too.
Sounds like the signing client shouldn't retry for a general 400, unless it's actually modified the request. Without looking at the code I would guess that we can just turn off retries altogether except for 5xx and connection errors.
Product: mozilla.org → Release Engineering
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