docs/reference: use table for proxy env-vars

Adding a description based on the Go documentation.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
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Sebastiaan van Stijn 2023-04-12 18:19:20 +02:00
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Because Docker is developed using Go, you can also use any environment 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: variables used by the Go runtime. In particular, you may find these useful:
* `HTTP_PROXY` | Variable | Description |
* `HTTPS_PROXY` |:--------------|:-------------------------------------------------------------------------------|
* `NO_PROXY` | `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. |
These Go environment variables are case-insensitive. See the See the [Go specification](https://pkg.go.dev/golang.org/x/net/http/httpproxy#Config)
[Go specification](https://golang.org/pkg/net/http/) for details on these for details on these variables.
variables.
## Configuration files ## Configuration files