podman/vendor/github.com/docker/go-connections/sockets/sockets.go

// Package sockets provides helper functions to create and configure Unix or TCP sockets.
package sockets

import (
	"errors"
	"net/http"
)

// ErrProtocolNotAvailable is returned when a given transport protocol is not provided by the operating system.
var ErrProtocolNotAvailable = errors.New("protocol not available")

// ConfigureTransport configures the specified Transport according to the
// specified proto and addr.
// If the proto is unix (using a unix socket to communicate) or npipe the
// compression is disabled.
func ConfigureTransport(tr *http.Transport, proto, addr string) error {
	switch proto {
	case "unix":
		return configureUnixTransport(tr, proto, addr)
	case "npipe":
		return configureNpipeTransport(tr, proto, addr)
	default:
		tr.Proxy = http.ProxyFromEnvironment
	}
	return nil
}