When fetching a specific post, a 404 HTTP status code should be returned if the post ID doesn't exist, instead of null. This provides better feedback to the frontend. FastAPI's `HTTPException` simplifies error handling, allowing specification of the status code (e.g., 404) and a detailed error message. For POST requests (creating a post), a 201 (Created) status code is preferred over the default 200 (OK). This is achieved by adding `status_code=status.HTTP_201_CREATED` to the path operation decorator. This segment introduces a more efficient and cleaner method for handling errors using Fast API's built-in HTTPException. It contrasts the previous approach with this improved method, showing how to raise an HTTP exception with a specific status code and message, resulting in a more streamlined and readable codebase. This segment demonstrates the problem of returning a null response when a requested post ID doesn't exist and explains the need for a more informative response to the frontend, highlighting the importance of providing clear feedback about the request's success or failure.