diff --git a/api.go b/api.go
index b8b7897c3..77faaaf23 100644
--- a/api.go
+++ b/api.go
@@ -87,7 +87,7 @@ func postAuth(srv *Server, version float64, w http.ResponseWriter, r *http.Reque
 	if err != nil {
 		return err
 	}
-	status, err := auth.Login(authConfig)
+	status, err := auth.Login(authConfig, srv.HTTPRequestFactory())
 	if err != nil {
 		return err
 	}
diff --git a/auth/auth.go b/auth/auth.go
index 6dd6ceb62..b9e1ee153 100644
--- a/auth/auth.go
+++ b/auth/auth.go
@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"github.com/dotcloud/docker/utils"
 	"io/ioutil"
 	"net/http"
 	"os"
@@ -140,7 +141,7 @@ func SaveConfig(configFile *ConfigFile) error {
 }
 
 // try to register/login to the registry server
-func Login(authConfig *AuthConfig) (string, error) {
+func Login(authConfig *AuthConfig, factory *utils.HTTPRequestFactory) (string, error) {
 	client := &http.Client{}
 	reqStatusCode := 0
 	var status string
@@ -171,7 +172,7 @@ func Login(authConfig *AuthConfig) (string, error) {
 			"Please check your e-mail for a confirmation link.")
 	} else if reqStatusCode == 400 {
 		if string(reqBody) == "\"Username or email already exists\"" {
-			req, err := http.NewRequest("GET", IndexServerAddress()+"users/", nil)
+			req, err := factory.NewRequest("GET", IndexServerAddress()+"users/", nil)
 			req.SetBasicAuth(authConfig.Username, authConfig.Password)
 			resp, err := client.Do(req)
 			if err != nil {
diff --git a/server.go b/server.go
index b015e459f..fa6f19ad4 100644
--- a/server.go
+++ b/server.go
@@ -1173,6 +1173,15 @@ func NewServer(flGraphPath string, autoRestart, enableCors bool, dns ListOpts) (
 	return srv, nil
 }
 
+func (srv *Server) HTTPRequestFactory() *utils.HTTPRequestFactory {
+	if srv.reqFactory == nil {
+		ud := utils.NewHTTPUserAgentDecorator(srv.versionInfos()...)
+		factory := utils.NewHTTPRequestFactory(ud)
+		srv.reqFactory = factory
+	}
+	return srv.reqFactory
+}
+
 func (srv *Server) LogEvent(action, id string) {
 	now := time.Now().Unix()
 	jm := utils.JSONMessage{Status: action, ID: id, Time: now}