Update fastapi/openapi/utils.py

3 years ago · 472401c4a3
1 changed files with 1 additions and 1 deletions
--- a/fastapi/openapi/utils.py
+++ b/fastapi/openapi/utils.py
@ -393,7 +393,7 @@ def get_openapi(
    terms_of_service: Optional[str] = None,
    contact: Optional[Dict[str, Union[str, Any]]] = None,
    license_info: Optional[Dict[str, Union[str, Any]]] = None,
-    prefix: Optional[str] = None,
+    prefix: Optional[str] = "",
 ) -> Dict[str, Any]:
    info: Dict[str, Any] = {"title": title, "version": version}
    if description: