Fix filer proxing http status code

Double quote etag value.

go/weed/weed_server/filer_server_handlers.go

@@ -103,6 +103,7 @@ func (fs *FilerServer) GetOrHeadHandler(w http.ResponseWriter, r *http.Request,
 	for k, v := range resp.Header {
 		w.Header()[k] = v
 	}
+	w.WriteHeader(resp.StatusCode)
 	io.Copy(w, resp.Body)
 }
 

go/weed/weed_server/volume_server_handlers.go

@@ -95,7 +95,7 @@ func (vs *VolumeServer) GetOrHeadHandler(w http.ResponseWriter, r *http.Request)
 		w.WriteHeader(http.StatusNotModified)
 		return
 	}
-	w.Header().Set("Etag", etag)
+	w.Header().Set("Etag", "\""+etag+"\"")
 	if n.NameSize > 0 && filename == "" {
 		filename = string(n.Name)
 		dotIndex := strings.LastIndex(filename, ".")