[Bug 1003633] [NEW] Escape plus character in apt HTTP requests to work around Amazon S3 bug

[Daniel Hartwig]

Effectively S3 does not implement HTTP according to the spec.  Rather
than working around the behaviour of S3 mirrors in methods/http we
could define methods/s3.  S3 mirrors would then be properly identified
as non-http in sources.list.

This method could be a wrapper which invokes the http method with a
transformed URI.

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Title:
  Escape plus character in apt HTTP requests to work around Amazon S3
  bug

Status in “apt” package in Ubuntu:
  New

Bug description:
  
  Amazon S3 performs incorrect query-string un-escaping on URLs and improperly converts the plus ('+') character to a space (' ') when processing incoming GET requests for files.  This causes apt-get to get HTTP 404 errors when downloading packages from S3-hosted mirrors which include a + character in the name of the package.

  For more background info, see:
  https://forums.aws.amazon.com/thread.jspa?threadID=55746

  One possibly solution is to change the call to QuoteString in http.cc
  to include '+' in the character set, which would escape the plus
  character to the %2B form, which will be properly processed by Amazon
  S3.

  Thanks,
  Doug

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