[Bug 1825001] Re: Allow archives to send a 4xx response to tell apt to try again later

[Julian Andres Klode]

503 also has a Retry-After field that you can use to communicate when to
retry, although we do not have any support for retrying things, apart
from twice a day, as systemd does not offer this ability to our type of
timer. And for interactive use, well, the user will retry manually.

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Title:
  Allow archives to send a 4xx response to tell apt to try again later

Status in apt package in Ubuntu:
  New

Bug description:
  As part of a broad plan to improve our ability to manage traffic to
  the archive servers, it would be useful if the archives could return a
  4xx response to indicate to apt that they were over capacity and it
  should try again later, where later could be defined on the client
  side as several hours, the next day for unattended-upgrades runs, etc.

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