503s from github until restart

We started getting 503s from github at around 5am this morning, from our fresh ping.

Restarting the dokku app fixed the issue.

It wasn't all urls (e.g. /info/refs seemed to work), but we couldn't checkout via the proxy until we restarted.

Possibly the connection got in a stuck state. We could maybe try using http/1.0 rather than http/1.1 if this happens again.