[Bug 1657567] Re: "Content-Range: */<file size>" on non-416 responses considered invalid

[Julian Andres Klode]

Verified in 1.2.20.

** Tags removed: verification-needed
** Tags added: verification-done

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https://bugs.launchpad.net/bugs/1657567

Title:
  "Content-Range: */<file size>" on non-416 responses considered invalid

Status in apt package in Ubuntu:
  Fix Released
Status in apt source package in Xenial:
  Fix Committed
Status in apt source package in Yakkety:
  In Progress

Bug description:
  APT only allows Content-Range: */<filesize> to be specified on a 416
  response. Sourceforge sometimes replies with that in a 302 redirect.

  We should probably just accept and silently ignore that content-range
  field for other values.

  [Impact]
  Issue breaks and other services that respond with a Content-Range header in a 302 redirect, or any non 416 one.

  [Test Case]
  Run

  /usr/lib/apt/apt-helper download-file -o debug::acquire::http=1
  http://www.jak-software.de/lp1657567 ubuntu.iso

  Before:

  E: Failed to fetch http://www.jak-software.de/lp1657567  The HTTP
  server sent an invalid Content-Range header Bad header data

  After:

  Redirect is followed successfully and a zesty live image is being
  downloaded.

  [Regression Potential]
  None

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