Update app.py

app.py

@@ -19,14 +19,11 @@ text_splitter = RecursiveCharacterTextSplitter(chunk_size=1000, chunk_overlap=10
 system_template = """
 Use the following pieces of context to answer the users question.
 If you don't know the answer, just say that you don't know, don't try to make up an answer.
-ALWAYS return a "Review_Url" part in your answer.
-The "Review_Url" part should be a reference to the source of the document from which you got your answer.
 
 Example of your response should be:
 
 ```
 The answer is foo
-Review_Url: xyz
 ```
 
 Begin!
@@ -79,11 +76,7 @@ async def init():
 @cl.on_message
 async def main(message):
     chain = cl.user_session.get("chain")
-    cb = cl.AsyncLangchainCallbackHandler(
-        stream_final_answer=True, answer_prefix_tokens=["FINAL", "ANSWER"]
-    )
-    cb.answer_reached = True
-    res = await chain.acall(message, callbacks=[cb])
+    res = await chain.acall(message)
 
     answer = res["result"]
     source_elements = []
@@ -108,8 +101,4 @@ async def main(message):
     else:
         answer += "\nNo sources found"
 
-    if cb.has_streamed_final_answer:
-        cb.final_stream.elements = source_elements
-        await cb.final_stream.update()
-    else:
-        await cl.Message(content=answer, elements=source_elements).send()
+    await cl.Message(content=answer, elements=source_elements).send()