Bug#28172: marked as done (HTTP Proxy cache refresh should be forced for corrupt packages)
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has caused the attached bug report to be marked as done.
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Date: Sun, 18 Oct 1998 21:59:11 -0700
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From: "Charles C. Fu" <ccwf@bacchus.com>
To: submit@bugs.debian.org
Subject: HTTP Proxy cache refresh should be forced for corrupt packages
Package: apt
Version: 0.1.7
If apt uses a proxy and detects that a package is corrupt (for
example, detecting a MD5 checksum mismatch or an appropriate error
while unpacking), then steps need to be taken to ensure that bad data
in any intermediate caches is flushed. Otherwise, apt often winds up
getting the same corrupt package over and over.
A possible strategy is to track which packages are corrupt and, on
the next download, include a 'Cache-Control: no-cache' header for
HTTP/1.1 proxies and/or a 'Pragma: no-cache' for HTTP/1.0 proxies
to force intermediate caches to obtain a new copy ('Cache-Control:
max-age=0' is not sufficient).
Eventually, if the proposed HTCP protocol is widely deployed by
proxies, it might be possible to use that mechanism to ask the proxies
to delete their copies of corrupt packages.
-ccwf
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