Support for NO_PROXY environment variable

[hgiddens]

As @mmaz mentioned in #127, NO_PROXY is supported by various tools to avoid involving the proxy for a selection of hosts. For example, in the environment I'm using http-client in, external services are only accessible via the proxy, whereas internal services are only accessible directly. Currently I'm working around this explicitly, but direct support for the NO_PROXY environment variable would mean that everything Just Works™.

Other tools that support the variable include:

• Emacs (as @mmaz mentioned)
• Wget
• cURL
• Python

Other systems typically support the same functionality, although not necessarily via environment variables or with the same syntax. For example, Java sports a http.nonProxyHosts system property.

If you're ok with the idea I'll have a go at an implementation.

[snoyberg]

I am not familiar with the environment variable, but have no objection.
Pull request certainly welcome. Please try to include a link to relevant
specs in the comments.

On Sun, Jul 26, 2015, 7:44 PM Huw notifications@github.com wrote:

As @mmaz https://github.com/mmaz mentioned in #127
#127, NO_PROXY is
supported by various tools to avoid involving the proxy for a selection of
hosts. For example, in the environment I'm using http-client in, external
services are only accessible via the proxy, whereas internal services are
only accessible directly. Currently I'm working around this explicitly, but
direct support for the NO_PROXY environment variable would mean that
everything Just Works™.

Other tools that support the variable include:

• Emacs
  http://www.gnu.org/software/emacs/manual/html_node/url/Proxies.html
  (as @mmaz https://github.com/mmaz mentioned)
• Wget http://www.gnu.org/software/wget/manual/html_node/Proxies.html
• cURL http://curl.haxx.se/docs/manual.html
• Python https://docs.python.org/2/library/urllib.html

Other systems typically support the same functionality, although not
necessarily via environment variables or with the same syntax. For example, Java
sports a http.nonProxyHosts system property
https://docs.oracle.com/javase/8/docs/api/java/net/doc-files/net-properties.html
.

If you're ok with the idea I'll have a go at an implementation.

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#140.

[snoyberg]

Merged in #145, closing. Thanks!