[Bug 1507887] Re: DistUpgradeFetcherKDE always errors on 403 releasenotes

[Harald Sitter]

This happens with apt-cacher set up as proxy making the requets go
through the cacher and breaking the request....

** No longer affects: ubuntu-release-upgrader (Ubuntu Vivid)

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: Triaged => Invalid

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https://bugs.launchpad.net/bugs/1507887

Title:
  DistUpgradeFetcherKDE always errors on 403 releasenotes

Status in ubuntu-release-upgrader package in Ubuntu:
  Invalid

Bug description:
  # Impact
  DistUpgradeFetcherKDE uses the HTML URI for release notes to get the html version and render it in a qtextview. The fetching however is handled through urllib and apparently there is server-side settings in place preventing the html to be fetched via urllib resulting in 403 errors no matter what. The errors in turn result in critical errors from which the present fetcher code doesn't let you proceed to the upgrade itself rendering upgrades impossible.

  # Test Case
  - `kdesudo -- do-release-upgrade -m desktop -f DistUpgradeViewKDE`
  - Upgrade nodes should be displayed without error

  # Regression Potential
  This technically degrades visual behavior of the fetcher, practically it doesn't since it appears to me that the HTML URI didn't work with live servers due to them apparently having always thrown 403s

  # Other Info
  Ideally IMO the server side restriction ought to be removed. History suggests this wouldn't get done quicker than this behavior change though.

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