Haskell 如何让Cabal绕过我的Windows代理设置？

使用Cabal检索包时，我经常收到以下消息错误：

用户错误（Codec.Compression.Zlib: 压缩流过早结束）

看起来Cabal正在使用我的Windows网络代理设置（用于Privoxy）

从谷歌周围的挖掘中，阴谋集团或其图书馆似乎遇到了问题 在这个地区

我能看到的可能解决方案有：

使用阴谋集团时关闭代理（不太喜欢这个）；或

获取补丁并开始黑客攻击。我对走这条路犹豫不决， 因为我是一个彻头彻尾的哈斯凯尔·努伯，我还不适应DARC；或

给它一个神奇的“CaniHaz无代理”参数。这就是问题所在

---

如果我的阅读正确，您应该能够将环境变量HTTP_PROXY设置为无效值（“工作吗”）以使其直接运行。

遵循@SamB的建议，并进行一些实验，我现在使用的解决方案是：

export HTTP_PROXY="::"

以下是实验日志的一部分：

尝试@SamB的解决方案：

[12:10:35z ~]:export HTTP_PROXY=""
[12:11:47z ~]:set|grep HTTP
HTTP_PROXY=
[12:11:50z ~]:cabal update
Downloading the latest package list from hackage.haskell.org
cabal.exe: connect: failed (Connection refused (WSAECONNREFUSED))

[12:11:54z ~]:export HTTP_PROXY="None"
[12:12:02z ~]:set|grep HTTP
HTTP_PROXY=None
[12:12:04z ~]:cabal update
Downloading the latest package list from hackage.haskell.org
cabal.exe: user error [\]
           (openTCPConnection: host lookup failure for "None")

[12:23:44z ~]:export HTTP_PROXY="::"
[12:24:00z ~]:set|grep HTTP
HTTP_PROXY=::
[12:24:04z ~]:cabal update
Downloading the latest package list from hackage.haskell.org
Warning: invalid http proxy uri: "::"
Warning: proxy uri must be http with a hostname
Warning: ignoring http proxy, trying a direct connection
Note: there is a new version of cabal-install available.
To upgrade, run: cabal install cabal-install
[12:24:34z ~]:

尝试“理性人”的解决方案：

[12:10:35z ~]:export HTTP_PROXY=""
[12:11:47z ~]:set|grep HTTP
HTTP_PROXY=
[12:11:50z ~]:cabal update
Downloading the latest package list from hackage.haskell.org
cabal.exe: connect: failed (Connection refused (WSAECONNREFUSED))

[12:11:54z ~]:export HTTP_PROXY="None"
[12:12:02z ~]:set|grep HTTP
HTTP_PROXY=None
[12:12:04z ~]:cabal update
Downloading the latest package list from hackage.haskell.org
cabal.exe: user error [\]
           (openTCPConnection: host lookup failure for "None")

[12:23:44z ~]:export HTTP_PROXY="::"
[12:24:00z ~]:set|grep HTTP
HTTP_PROXY=::
[12:24:04z ~]:cabal update
Downloading the latest package list from hackage.haskell.org
Warning: invalid http proxy uri: "::"
Warning: proxy uri must be http with a hostname
Warning: ignoring http proxy, trying a direct connection
Note: there is a new version of cabal-install available.
To upgrade, run: cabal install cabal-install
[12:24:34z ~]:

尝试“不讲道理的人”的解决方案：

[12:10:35z ~]:export HTTP_PROXY=""
[12:11:47z ~]:set|grep HTTP
HTTP_PROXY=
[12:11:50z ~]:cabal update
Downloading the latest package list from hackage.haskell.org
cabal.exe: connect: failed (Connection refused (WSAECONNREFUSED))

[12:11:54z ~]:export HTTP_PROXY="None"
[12:12:02z ~]:set|grep HTTP
HTTP_PROXY=None
[12:12:04z ~]:cabal update
Downloading the latest package list from hackage.haskell.org
cabal.exe: user error [\]
           (openTCPConnection: host lookup failure for "None")

[12:23:44z ~]:export HTTP_PROXY="::"
[12:24:00z ~]:set|grep HTTP
HTTP_PROXY=::
[12:24:04z ~]:cabal update
Downloading the latest package list from hackage.haskell.org
Warning: invalid http proxy uri: "::"
Warning: proxy uri must be http with a hostname
Warning: ignoring http proxy, trying a direct connection
Note: there is a new version of cabal-install available.
To upgrade, run: cabal install cabal-install
[12:24:34z ~]:

---

耶

谢谢你。我现在正在路上，希望能在复活节期间试一试。好的，测试过了。我遵循了你的指导方针，最终成功了。我已经接受了你的答案+1，并根据你的提示发布了我的解决方案。再次感谢。我不知道你为什么称之为“不合理的人”的解决方案——我说过你应该尝试一个无效的值：-）。