[Bug 1988290] [NEW] NO_PROXY doesn't work for IPv6 literals

[Paride Legovini]

Public bug reported:

[Partial copypaste from the linked upstream bug.]

Setting

  NO_PROXY=localhost,127.0.0.1,::1

enables connections to http://localhost and http://127.0.0.1 and does
not work for http://[::1] at all. Apparently the problem is caused by an
assumption [1] that a hostname cannot contain a colon.

[1]
https://github.com/curl/curl/blob/7e35eb77292fe6464889ddc8329c6a64136f969d/lib/url.c#L2577

** Affects: curl
     Importance: Unknown
         Status: Unknown

** Affects: curl (Ubuntu)
     Importance: Undecided
         Status: Fix Released

** Affects: curl (Ubuntu Bionic)
     Importance: Undecided
         Status: Triaged

** Also affects: curl (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Changed in: curl (Ubuntu Bionic)
       Status: New => Triaged

** Changed in: curl (Ubuntu)
       Status: New => Fix Released

** Bug watch added: github.com/curl/curl/issues #2353
   https://github.com/curl/curl/issues/2353

** Also affects: curl via
   https://github.com/curl/curl/issues/2353
   Importance: Unknown
       Status: Unknown

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https://bugs.launchpad.net/bugs/1988290

Title:
  NO_PROXY doesn't work for IPv6 literals

Status in Curl:
  Unknown
Status in curl package in Ubuntu:
  Fix Released
Status in curl source package in Bionic:
  Triaged

Bug description:
  [Partial copypaste from the linked upstream bug.]

  Setting

    NO_PROXY=localhost,127.0.0.1,::1

  enables connections to http://localhost and http://127.0.0.1 and does
  not work for http://[::1] at all. Apparently the problem is caused by
  an assumption [1] that a hostname cannot contain a colon.

  [1]
  https://github.com/curl/curl/blob/7e35eb77292fe6464889ddc8329c6a64136f969d/lib/url.c#L2577

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