Editing Openai/694ab010-3e7c-8000-b0e8-b98c22b7a063 (section)

=== User: 1 You split Streamlit and FastAPI not because AWS is complicated, but because security, cost, and reliability fundament… ===
1) You split Streamlit and FastAPI not because AWS is complicated, but because security, cost, and reliability fundamentally break when UI and backend share secrets, scaling, and traffic patterns . then is needed  fastapi python code to be stateful to have same user new conversation remember this user past conversations and for rag to be able to use embedding from used files from past ?  2) can not understand . i need my ui will be used from any users ?  3) can not understand Correct mapping
API Gateway → FastAPI
ALB → Streamlit

Each service gets traffic it is designed to handle.

Analogy:

API Gateway is a call center

Streamlit UI is a website

You do not route website traffic through a call center. do you mean external to aws user will use only ALB. then why needed  API Gateway → FastAPI for my backend python code based on fastapi? 4) better explain : D. Independent scaling (this is where money and reliability matter)