René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Better error message when HTTP_PROXY is down.","articleBody":"Quoting https://github.com/haskell/cabal/issues/1962:\n\n\u003e In order to avoid  #1602 I upgraded HTTP to version 4000.2.17. But I noticed a new (minor) problem: If the proxy mentioned in http_proxy is down, I get\n\u003e \n\u003e ```\n\u003e (sid)root@kirk:~# unset http_proxy\n\u003e (sid)root@kirk:~#  cabal update\n\u003e Downloading the latest package list from hackage.haskell.org\n\u003e (sid)root@kirk:~# export http_proxy=http://localhost:3128/\n\u003e (sid)root@kirk:~#  cabal update\n\u003e Downloading the latest package list from hackage.haskell.org\n\u003e cabal: does not exist\n\u003e # now starting the proxy\n\u003e (sid)root@kirk:~#  cabal update\n\u003e Downloading the latest package list from hackage.haskell.org\n\u003e ```\n\u003e \n\u003e Certainly the error message could be more helpful.\n","author":{"url":"https://github.com/23Skidoo","@type":"Person","name":"23Skidoo"},"datePublished":"2015-04-28T02:16:46.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/84/HTTP/issues/84"}