[Bug 1750625] Re: update misinterprets 304 response on Packages.gz

[Julian Andres Klode]

I think a problem is that your Release file is missing a Date field. APT
should not be trying to redownload unmodified files.

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Title:
  update misinterprets 304 response on Packages.gz

Status in apt package in Ubuntu:
  New

Bug description:
  Description:	Ubuntu 16.04.3 LTS
  Release:	16.04

  ii  apt                              1.2.24                                      amd64        commandline package manager
  ii  apt-transport-https              1.2.24                                      amd64        https download transport for APT
  ii  apt-utils                        1.2.24                                      amd64        package management related utility programs
  ii  libapt-inst2.0:amd64             1.2.24                                      amd64        deb package format runtime library
  ii  libapt-pkg5.0:amd64              1.2.24                                      amd64        package management runtime library

  Expected behaviour:

  If apt-get gets a 304 Not Modified when requesting Packages.gz, it
  should ignore the package list (i.e., there's no update).

  Observed behaviour:

  Added a local repository to
  /etc/apt/sources.list.d/instafreight_php.list:

  > deb [arch=amd64 trusted=yes] http://ubuntu/instafreight xenial php

  The first time running apt-get update succeeds; in addition,
  apache.log shows:

  > 10.0.4.72 - - [20/Feb/2018:12:01:39 -0500] "GET
  /instafreight/dists/xenial/php/binary-amd64/Packages.gz HTTP/1.1" 200
  745 "-" "Debian APT-HTTP/1.3 (1.2.24)"

  I am able to install packages from that repo without error.

  Running apt-get a 2nd time succeeds. apache.log doesn't show a request
  for Packages.gz

  Running apt-get a 3rd time, apache.log shows:

  > 10.0.4.72 - - [20/Feb/2018:12:04:45 -0500] "GET
  /instafreight/dists/xenial/php/binary-amd64/Packages.gz HTTP/1.1" 304
  124 "-" "Debian APT-HTTP/1.3 (1.2.24)"

  However, on the console where I ran apt-get, the corresponding output
  is:

  > Err:15 http://ubuntu/instafreight xenial/php amd64 Packages
  >   404  Not Found
  > ...
  > E: Failed to fetch http://ubuntu/instafreight/dists/xenial/php/binary-amd64/Packages.gz  404  Not Found
  > E: Some index files failed to download. They have been ignored, or old ones used instead.

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