Fix

app.py

@@ -166,9 +166,9 @@ class BatchDocResponse(BaseModel):
 
 class KeywordRequest(BaseModel):
     keywords: str
-    release: Optional[str] = None
-    wg: Optional[str] = None
-    spec_type: Optional[Literal["TS", "TR"]] = None
+    release: Optional[str|None] = None
+    wg: Optional[str|None] = None
+    spec_type: Optional[Literal["TS", "TR", None]] = None
     mode: Optional[Literal["and", "or"]] = "and"
 
 class KeywordResponse(BaseModel):