another fix

backend/cmd/server/main.go

@@ -80,6 +80,7 @@ func main() {
 	downloadHandler := downloads.NewHandler(galleryRepository, mediaRepository, objectStorage, authService, downloadService)
 	devHandler := devtools.NewHandler(database, objectStorage, authService, devtools.Config{
 		DBDriver:        cfg.DBDriver,
+		APIURL:          cfg.APIURL,
 		StorageEndpoint: cfg.StorageEndpoint,
 		StorageBucket:   cfg.StorageBucket,
 		StorageUseSSL:   cfg.StorageUseSSL,
@@ -113,7 +114,11 @@ func main() {
 	}
 
 	go func() {
-		log.Printf("API listening on http://localhost%s", server.Addr)
+		addr := cfg.APIURL
+		if addr == "" {
+			addr = "http://localhost" + server.Addr
+		}
+		log.Printf("API listening on %s", addr)
 		if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
 			log.Fatalf("server failed: %v", err)
 		}