diff --git a/cmd/serve/s3/backend.go b/cmd/serve/s3/backend.go
index 4c7643697a22a..ff5c8a4a93770 100644
--- a/cmd/serve/s3/backend.go
+++ b/cmd/serve/s3/backend.go
@@ -41,15 +41,18 @@ func newBackend(opt *Options, w *Server) gofakes3.Backend {
 }
 
 func (b *s3Backend) setAuthForWebDAV(accessKey string) *vfs.VFS {
-	// new VFS
-	if _, ok := b.w.f.(*webdav.Fs); ok {
-		info, name, remote, config, _ := fs.ConfigFs(b.w.f.Name() + ":")
-		f, _ := info.NewFs(context.Background(), name+accessKey, remote, config)
-		vf := vfs.New(f, &vfsflags.Opt)
-		vf.Fs().(*webdav.Fs).SetBearerToken(accessKey)
-		return vf
-	}
-	return vfs.New(b.w.f, &vfsflags.Opt)
+	if b.opt.asProxy {
+		// new VFS
+		if _, ok := b.w.f.(*webdav.Fs); ok {
+			info, name, remote, config, _ := fs.ConfigFs(b.w.f.Name() + ":")
+			f, _ := info.NewFs(context.Background(), name+accessKey, remote, config)
+			vf := vfs.New(f, &vfsflags.Opt)
+			vf.Fs().(*webdav.Fs).SetBearerToken(accessKey)
+			return vf
+		}
+		return vfs.New(b.w.f, &vfsflags.Opt)
+	}
+	return b.w.vfs
 }
 
 // ListBuckets always returns the default bucket.
diff --git a/cmd/serve/s3/s3.go b/cmd/serve/s3/s3.go
index db9e384915265..293843f501593 100644
--- a/cmd/serve/s3/s3.go
+++ b/cmd/serve/s3/s3.go
@@ -19,6 +19,7 @@ var DefaultOpt = Options{
 	hashName:       "MD5",
 	hashType:       hash.MD5,
 	noCleanup:      false,
+	asProxy:        false,
 	HTTP:           httplib.DefaultCfg(),
 }
 
@@ -35,6 +36,7 @@ func init() {
 	flags.StringVarP(flagSet, &Opt.hashName, "etag-hash", "", Opt.hashName, "Which hash to use for the ETag, or auto or blank for off", "")
 	flags.StringArrayVarP(flagSet, &Opt.authPair, "auth-key", "", Opt.authPair, "Set key pair for v4 authorization: access_key_id,secret_access_key", "")
 	flags.BoolVarP(flagSet, &Opt.noCleanup, "no-cleanup", "", Opt.noCleanup, "Not to cleanup empty folder after object is deleted", "")
+	flags.BoolVarP(flagSet, &Opt.asProxy, "as-proxy", "", Opt.asProxy, "Serve as a proxy", "")
 }
 
 //go:embed serve_s3.md
diff --git a/cmd/serve/s3/server.go b/cmd/serve/s3/server.go
index 192c4d031d803..ec4584ec34334 100644
--- a/cmd/serve/s3/server.go
+++ b/cmd/serve/s3/server.go
@@ -24,6 +24,7 @@ type Options struct {
 	hashType       hash.Type
 	authPair       []string
 	noCleanup      bool
+	asProxy        bool
 	HTTP           httplib.Config
 }