fix: improve error message

pallets · Aug 13, 2023 · a0f4bf4 · a0f4bf4
1 parent 1886322
commit a0f4bf4
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/werkzeug/routing/rules.py b/src/werkzeug/routing/rules.py
@@ -454,7 +454,7 @@ def __init__(
         websocket: bool = False,
     ) -> None:
         if not string.startswith("/"):
-            raise ValueError("urls must start with a leading slash")
+            raise ValueError("urls must start with a leading slash:", string)
         self.rule = string
         self.is_leaf = not string.endswith("/")
         self.is_branch = string.endswith("/")