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

[Steve Langasek]

>From my discussions in person at the last sprint, it would be useful to
have User-Agent information that lets the server distinguish between
interactive vs non-interactive clients (i.e.: unattended-upgrades) in
order to tell u-u to go away and try later for cases when the server /
Internet connection are saturated and delivering a poor QoS to all users
due to events.

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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:
  Triaged

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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