Re: Cabal can't open a TCP connection

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@atamo.com] *Sent:* 08 May 2014 14:48 *To:* Simon Peyton Jones *Cc:* Herbert Valerio Riedel; Simon Marlow; ghc-devs@haskell.org *Subject:* Re: Cabal can't open a TCP connection

On Thu, May 8, 2014 at 8:22 PM, Simon Peyton Jones mailto:simonpj@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

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*Från: *Simon Peyton Jones mailto:simonpj@microsoft.com *Skickat: *‎2014-‎05-‎08 14:04 *Till: *ghc-devs@haskell.org mailto:ghc-devs@haskell.org *Kopia: *Simon Marlow mailto:marlowsd@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@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@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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