How do you structure concurrent API calls with asyncio.gather in FastAPI?
Tests FastAPI async concurrency. Strong answer: async def endpoint with two async HTTP requests in asyncio.gather, cutting total latency from sum to max of the two. Red flag: using sync clients or threads instead of async I/O.
Tests whether you understand FastAPI's async event loop for I/O-bound concurrency versus parallelism. A strong candidate defines an async path operation, uses an async HTTP client like httpx or aiohttp, launches both requests with asyncio.gather, and explains that because the calls are independent and I/O-bound, the event loop switches between them so total latency becomes roughly max(300ms, 250ms) instead of 550ms. Red flag: dropping synchronous requests or threading inside an async endpoint, which blocks the loop and defeats the purpose.
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