integration-cli/docker_cli_proxy_test.go
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 package main
 
 import (
 	"net"
 	"strings"
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 	"testing"
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 	"gotest.tools/assert"
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 	"gotest.tools/icmd"
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 )
 
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 func (s *DockerSuite) TestCLIProxyDisableProxyUnixSock(c *testing.T) {
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 	testRequires(c, DaemonIsLinux, testEnv.IsLocalDaemon)
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 	icmd.RunCmd(icmd.Cmd{
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 		Command: []string{dockerBinary, "info"},
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 		Env:     appendBaseEnv(false, "HTTP_PROXY=http://127.0.0.1:9999"),
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 	}).Assert(c, icmd.Success)
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 }
 
 // Can't use localhost here since go has a special case to not use proxy if connecting to localhost
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 // See https://golang.org/pkg/net/http/#ProxyFromEnvironment
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 func (s *DockerDaemonSuite) TestCLIProxyProxyTCPSock(c *testing.T) {
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 	// get the IP to use to connect since we can't use localhost
 	addrs, err := net.InterfaceAddrs()
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 	assert.NilError(c, err)
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 	var ip string
 	for _, addr := range addrs {
 		sAddr := addr.String()
 		if !strings.Contains(sAddr, "127.0.0.1") {
 			addrArr := strings.Split(sAddr, "/")
 			ip = addrArr[0]
 			break
 		}
 	}
 
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 	assert.Assert(c, ip != "")
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 	s.d.Start(c, "-H", "tcp://"+ip+":2375")
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 	icmd.RunCmd(icmd.Cmd{
 		Command: []string{dockerBinary, "info"},
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 		Env:     []string{"DOCKER_HOST=tcp://" + ip + ":2375", "HTTP_PROXY=127.0.0.1:9999"},
 	}).Assert(c, icmd.Expected{Error: "exit status 1", ExitCode: 1})
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 	// Test with no_proxy
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 	icmd.RunCmd(icmd.Cmd{
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 		Command: []string{dockerBinary, "info"},
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 		Env:     []string{"DOCKER_HOST=tcp://" + ip + ":2375", "HTTP_PROXY=127.0.0.1:9999", "NO_PROXY=" + ip},
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 	}).Assert(c, icmd.Success)
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 }