Premature timeout on git.postgresql.org?

Trying to check out from the git mirror on a machine with a
slow internet connection, I repeatably get

$ time git clone https://git.postgresql.org/git/postgresql.git pgsql
Cloning into 'pgsql'...
remote: Enumerating objects: 14523, done.
remote: Counting objects: 100% (14523/14523), done.
remote: Compressing objects: 100% (9482/9482), done.
error: RPC failed; curl 92 HTTP/2 stream 3 was not closed cleanly before end of the underlying stream
fetch-pack: unexpected disconnect while reading sideband packet
fatal: early EOF
fatal: fetch-pack: invalid index-pack output
      364.36 real         0.02 user         0.08 sys

It gets almost but not quite to the end of the data-transfer stage
before failing.  I think I've seen this symptom before, and IIRC
we traced it to a poorly-chosen timeout somewhere in the PG web
infrastructure.  I can't find a record of that in the archives,
though; the closest thing is [1] which is a somewhat different
symptom.

            regards, tom lane

[1] https://www.postgresql.org/message-id/flat/CAGuFTBUrqO8kK_J2URKpWwathQSunZU6VtqMSrJnEt8F0qZaTg%40mail.gmail.com