@@ -11,6 +11,7 @@ import (

 	log "github.com/Sirupsen/logrus"

 	"github.com/docker/docker/registry/v2"

+	"github.com/docker/docker/utils"

 )

 // for mocking in unit tests

@@ -133,24 +134,25 @@ func (e *Endpoint) Path(path string) string {

 func (e *Endpoint) Ping() (RegistryInfo, error) {

 	// The ping logic to use is determined by the registry endpoint version.

+	factory := HTTPRequestFactory(nil)

 	switch e.Version {

 	case APIVersion1:

-		return e.pingV1()

+		return e.pingV1(factory)

 	case APIVersion2:

-		return e.pingV2()

+		return e.pingV2(factory)

 	}

 	// APIVersionUnknown

 	// We should try v2 first...

 	e.Version = APIVersion2

-	regInfo, errV2 := e.pingV2()

+	regInfo, errV2 := e.pingV2(factory)

 	if errV2 == nil {

 		return regInfo, nil

 	}

 	// ... then fallback to v1.

 	e.Version = APIVersion1

-	regInfo, errV1 := e.pingV1()

+	regInfo, errV1 := e.pingV1(factory)

 	if errV1 == nil {

 		return regInfo, nil

 	}

@@ -159,7 +161,7 @@ func (e *Endpoint) Ping() (RegistryInfo, error) {

 	return RegistryInfo{}, fmt.Errorf("unable to ping registry endpoint %s\nv2 ping attempt failed with error: %s\n v1 ping attempt failed with error: %s", e, errV2, errV1)

 }

-func (e *Endpoint) pingV1() (RegistryInfo, error) {

+func (e *Endpoint) pingV1(factory *utils.HTTPRequestFactory) (RegistryInfo, error) {

 	log.Debugf("attempting v1 ping for registry endpoint %s", e)

 	if e.String() == IndexServerAddress() {

@@ -168,7 +170,7 @@ func (e *Endpoint) pingV1() (RegistryInfo, error) {

 		return RegistryInfo{Standalone: false}, nil

 	}

-	req, err := http.NewRequest("GET", e.Path("_ping"), nil)

+	req, err := factory.NewRequest("GET", e.Path("_ping"), nil)

 	if err != nil {

 		return RegistryInfo{Standalone: false}, err

 	}

@@ -213,10 +215,10 @@ func (e *Endpoint) pingV1() (RegistryInfo, error) {

 	return info, nil

 }

-func (e *Endpoint) pingV2() (RegistryInfo, error) {

+func (e *Endpoint) pingV2(factory *utils.HTTPRequestFactory) (RegistryInfo, error) {

 	log.Debugf("attempting v2 ping for registry endpoint %s", e)

-	req, err := http.NewRequest("GET", e.Path(""), nil)

+	req, err := factory.NewRequest("GET", e.Path(""), nil)

 	if err != nil {

 		return RegistryInfo{}, err

 	}