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docs/reference: use table for proxy env-vars
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Adding a description based on the Go documentation.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
(cherry picked from commit 3701748)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
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thaJeztah committed Apr 13, 2023
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15 changes: 8 additions & 7 deletions docs/reference/commandline/cli.md
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Because Docker is developed using Go, you can also use any environment
variables used by the Go runtime. In particular, you may find these useful:

* `HTTP_PROXY`
* `HTTPS_PROXY`
* `NO_PROXY`

These Go environment variables are case-insensitive. See the
[Go specification](https://golang.org/pkg/net/http/) for details on these
variables.
| Variable | Description |
|:--------------|:-------------------------------------------------------------------------------|
| `HTTP_PROXY` | Proxy URL for HTTP requests unless overridden by NoProxy. |
| `HTTPS_PROXY` | Proxy URL for HTTPS requests unless overridden by NoProxy. |
| `NO_PROXY` | Comma-separated values specifying hosts that should be excluded from proxying. |

See the [Go specification](https://pkg.go.dev/golang.org/x/net/http/httpproxy#Config)
for details on these variables.

## Configuration files

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