Fix static handler 404 error

app/classes/web/static_handler.py

@@ -0,0 +1,15 @@
+import tornado.web
+from typing import (
+    Optional
+)
+
+from app.classes.shared.console import console
+
+class CustomStaticHandler(tornado.web.StaticFileHandler):
+    def validate_absolute_path(self, root: str, absolute_path: str) -> Optional[str]:
+        try:
+            return super().validate_absolute_path(root, absolute_path)
+        except tornado.web.HTTPError as error:
+            if 'HTTP 404: Not Found' in str(error):
+                self.set_status(404)
+                self.finish({'error':'NOT_FOUND', 'info':'The requested resource was not found on the server'})

app/classes/web/tornado.py

@@ -25,6 +25,7 @@ try:
     from app.classes.web.ajax_handler import AjaxHandler
     from app.classes.web.api_handler import ServersStats, NodeStats
     from app.classes.web.websocket_handler import SocketHandler
+    from app.classes.web.static_handler import CustomStaticHandler
     from app.classes.shared.translation import translation
 
 except ModuleNotFoundError as e:
@@ -143,7 +144,9 @@ class Webserver:
             autoreload=False,
             log_function=self.log_function,
             login_url="/login",
-            default_handler_class=PublicHandler
+            default_handler_class=PublicHandler,
+            static_handler_class=CustomStaticHandler,
+            serve_traceback=debug_errors,
         )
 
         self.HTTP_Server = tornado.httpserver.HTTPServer(app)