refactor(api): introduce libhttp usage (#2263)

api/http/handler/dockerhub/dockerhub_inspect.go

@@ -3,8 +3,8 @@ package dockerhub
 import (
 	"net/http"
 
-	httperror "github.com/portainer/portainer/http/error"
-	"github.com/portainer/portainer/http/response"
+	httperror "github.com/portainer/libhttp/error"
+	"github.com/portainer/libhttp/response"
 )
 
 // GET request on /api/dockerhub

api/http/handler/dockerhub/dockerhub_update.go

@@ -4,10 +4,10 @@ import (
 	"net/http"
 
 	"github.com/asaskevich/govalidator"
+	httperror "github.com/portainer/libhttp/error"
+	"github.com/portainer/libhttp/request"
+	"github.com/portainer/libhttp/response"
 	"github.com/portainer/portainer"
-	httperror "github.com/portainer/portainer/http/error"
-	"github.com/portainer/portainer/http/request"
-	"github.com/portainer/portainer/http/response"
 )
 
 type dockerhubUpdatePayload struct {

api/http/handler/dockerhub/handler.go

@@ -4,8 +4,8 @@ import (
 	"net/http"
 
 	"github.com/gorilla/mux"
+	httperror "github.com/portainer/libhttp/error"
 	"github.com/portainer/portainer"
-	httperror "github.com/portainer/portainer/http/error"
 	"github.com/portainer/portainer/http/security"
 )