Cabal can't open a TCP connection

[Ganesh Sittampalam]

I think this fix would belong in the HTTP library.

I've opened https://github.com/haskell/HTTP/issues/66 - the only
argument against making the change I can see is that it might not be
consistent with other tools, but that doesn't seem to be the case.

If noone has an opposing view I'll probably implement it soon.


On 08/05/2014 17:20, Simon Peyton Jones wrote:
> Spot on, Kim-Ee.  Thanks.  unsetting http_proxy fixed it.
> 
>  
> 
> I’m fwding to cabal-devel: it would be great that if “http_proxy” was
> set to “”, then it behaved just as if it was un-set.  The current
> behaviour is very confusing (to me anyway).
> 
>  
> 
> Simon
> 
>  
> 
> *From:*Kim-Ee Yeoh [mailto:ky3 at atamo.com]
> *Sent:* 08 May 2014 14:48
> *To:* Simon Peyton Jones
> *Cc:* Herbert Valerio Riedel; Simon Marlow; ghc-devs at haskell.org
> *Subject:* Re: Cabal can't open a TCP connection
> 
>  
> 
>  
> 
> On Thu, May 8, 2014 at 8:22 PM, Simon Peyton Jones
> <simonpj at microsoft.com <mailto:simonpj at microsoft.com>> wrote:
> 
>     On a machine that doesn't need to use a proxy server, what should
>     $http_proxy be set to?
> 
>  
> 
> It's a Maybe (Maybe String) problem. Blame Cabal for not ignoring an
> empty http_proxy. The *nix programs I've tried treat empty as unset.
> 
> The solution is: unset HTTP_PROXY.
> 
> 
> -- Kim-Ee
> 
>  
> 
> ------------------------------------------------------------------------
> 
> *Från: *Simon Peyton Jones <mailto:simonpj at microsoft.com>
> *Skickat: *‎2014-‎05-‎08 14:04
> *Till: *ghc-devs at haskell.org <mailto:ghc-devs at haskell.org>
> *Kopia: *Simon Marlow <mailto:marlowsd at gmail.com>
> *Ämne: *Cabal can't open a TCP connection
> 
> Dear ghc-devs
> 
> Cabal can’t open a TCP connection from my Linux box.  It used to work
> fine.  Here’s what it says:
> 
> cabal -v3 update
> 
> Downloading the latest package list from hackage.haskell.org
> 
> Sending:
> 
> GET http://hackage.haskell.org/packages/archive/00-index.tar.gz HTTP/1.1
> 
> User-Agent: cabal-install/1.16.0.2
> 
> Host: hackage.haskell.org
> 
> proxy uri host: , port:
> 
> Creating new connection to
> 
> cabal: openTCPConnection: host lookup failure for ""
> 
>  
> 
> simonpj at cam-05-unx:~/code/HEAD$ cabal --version
> 
> cabal-install version 1.16.0.2
> 
> using version 1.16.0.3 of the Cabal library
> 
> simonpj at cam-05-unx:~/code/HEAD$
> 
> Can anyone help me work out what to do?  git works just fine, so the
> internet is connected all right.
> 
> Thanks
> 
> Simon
> 
>  
> 
> 
> 
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