retry HTTP 499 errors by default #1612
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HTTP 499 is a status code that nginx made up to indicate the client hung up before the server responded. See https://en.wikipedia.org/wiki/List_of_HTTP_status_codes#nginx
We're seeing this response relatively often coming from blob requests to Cloudflare R2, and retrying in general seems to work just fine.
If a 499 is encountered multiple times, the overall blob request will still fail, so a persistent 499 issue should be surfaced to the user after a brief delay, just like with 502, etc.
Since it's unofficial there's no Go const for 499. See https://pkg.go.dev/net/http#pkg-constants