Update app.py

app.py

@@ -169,6 +169,6 @@ def generate(user_input):
 # Define API endpoint to receive queries and provide responses
 @app.post("/update/")
 def generate(index_url): 
-    retriever_chain = index_urls_in_rag(index_url)
+    retriever_chain = index_urls_in_rag([index_url])
     retriever_chain.invoke("Was ist bofrost*")
     get_response("Was kosten Schoko Osterhasen?")