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

[Paride Legovini]

Fixed upstream and in >= Focal by:

https://github.com/curl/curl/commit/b7f90470be9b75f57167abbcd63aadb2e3b33958

** Description changed:

+ [Partial copypaste from the linked upstream bug.]
+ 
  Setting
  
-   NO_PROXY=localhost,127.0.0.1,::1
+   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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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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