Error sending request: connection closed before message completed

[dtolnay]

I got this in response to a move 12 1 command on Zulip:

Failed to parse movement, expected move <from> <to>: failed to get RDS cert

Caused by:
0: error sending request for url (https://s3.amazonaws.com/rds-downloads/rds-ca-2019-root.pem): connection closed before message completed
1: connection closed before message completed.

I tried the same command again and it worked.

Possibly same root cause as #332?

[Mark-Simulacrum]

Hm, so not sure about the other issue, but it looks like for this at least the likely culprit is the problem identified in hyperium/hyper#2136 where S3's timeouts are different from hyper's. Presumably this is trivially reproducible if you send requests "exactly" 20 seconds apart, or so.

I suspect something similar is also the case for CloudFront (which backs the team-api links in #332).

I think the easiest fix here is to just not do keep-alive, I guess? I suppose we should retry in theory... I wonder how e.g. curl and friends deal with this situation.