One further changes to fix propagate exceptions.

Author: Peter Doggart

flask_restx/api.py

@@ -673,6 +673,18 @@ def error_router(self, original_handler, e):
                 return original_handler(f)
         return original_handler(e)
 
+    def _propagate_exceptions(self):
+        """
+        Returns the value of the ``PROPAGATE_EXCEPTIONS`` configuration
+        value in case it's set, otherwise return true if app.debug or
+        app.testing is set. This method was deprecated in Flask 2.3 but
+        we still need it for our error handlers.
+        """
+        rv = current_app.config.get("PROPAGATE_EXCEPTIONS")
+        if rv is not None:
+            return rv
+        return current_app.testing or current_app.debug
+
     def handle_error(self, e):
         """
         Error handler for the API transforms a raised exception into a Flask response,
@@ -685,10 +697,7 @@ def handle_error(self, e):
         # client if a handler is configured for the exception.
         if (
             not isinstance(e, HTTPException)
-            and (
-                current_app.config.get("PROPAGATE_EXCEPTIONS")
-                or (current_app.testing or current_app.debug)
-            )
+            and self._propagate_exceptions()
             and not isinstance(e, tuple(self._own_and_child_error_handlers.keys()))
         ):
             exc_type, exc_value, tb = sys.exc_info()