Add documentation for HTTP proxies

[icecrime]

This provides documentation for #9951, already merged in master.

Replaces #10133

[icecrime]

Ping @jfrazelle!

[jessfraz]

Yay thank you! LGTM

[SvenDowideit]

LGTM - @fredlf @jamtur01

[jamtur01]

LGTM

[icecrime]

Well that was fast, thanks! 👍

[coolljt0725]

@icecrime @jfrazelle I think we should add the help message in the CLI return message when client can't connect to the daemon due to the proxy and suggest then what to do.Maybe something like this FATA[0000] Error response from daemon: 404 page not found, if you set http_proxy or https_proxy, you can add /var/run/docker.sock to no_proxy and try again. Because most people don't view the docs often especially for those have the experience in using docker, and in this way they konw what to do when meet this situation.

[jessfraz]

See the only problem is not everyone is going to want to setup a proxy so
pushing them towards that in an error message can be misleading... I'm not
sure exactly what to do tho because I agree many might not see the docs,
but I don't know how we can know for sure they want a proxy

On Mon, Jan 19, 2015 at 5:21 PM, leijitang notifications@github.com wrote:

@icecrime https://github.com/icecrime @jfrazelle
https://github.com/jfrazelle I think we should add the help message in
the CLI return message when client can't connect to the daemon due to the
proxy and suggest then what to do.Maybe something like this FATA[0000]
Error response from daemon: 404 page not found, if you set http_proxy or
https_proxy, you can add /var/run/docker.sock to no_proxy and try again.
Because most people don't view the docs often especially for those have the
experience in using docker, and in this way they konw what to do when meet
this situation.

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#10192 (comment).

[acgtyrant]

@jfrazelle I can tell you that many Chinese user will set the proxy environment because of the fucking GFW. So you can add the help message in the CLI, Thank you!

[jessfraz]

We ended up adding a better fix
https://github.com/docker/docker/pull/10739/files

On Sunday, February 22, 2015, Isaac Ge notifications@github.com wrote:

@jfrazelle https://github.com/jfrazelle I can tell you that many
Chinese user will set the proxy environment because of the fucking GFW. So
you can add the help message in the CLI, Thank you!

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#10192 (comment).

[jessfraz]

the one released today, it might have also been in 1.5.0 i cant remember
off the top of my head

On Thu, Apr 16, 2015 at 6:46 AM, Piotr Dobrogost notifications@github.com
wrote:

@jfrazelle https://github.com/jfrazelle
What version of docker is this patch going to be released in?

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#10192 (comment).

[piotr-dobrogost]

@jfrazelle

Do you refer to v1.6.0-rc7? If so then I should have been more precise and specify that I'm concerned with stable releases.

[thaJeztah]

@piotr-dobrogost you're in luck; 1.6 was just pushed out the door