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What occurs if a FastAPI endpoint returns FileResponse with a file path that does not exist on the server?

medium📝 component behavior Q5 of 15
FastAPI - File Handling
What occurs if a FastAPI endpoint returns FileResponse with a file path that does not exist on the server?
AFastAPI raises a 404 Not Found error automatically
BThe server returns an empty response with status 200
CThe client receives a corrupted file
DFastAPI silently creates an empty file and sends it
Step-by-Step Solution
Solution:

  1. Step 1: Behavior of FileResponse with missing files

    If the file path does not exist, FileResponse raises a 404 Not Found error by default.

  2. Step 2: Why other options are incorrect

    It does not send empty or corrupted files, nor does it create files automatically.

  3. Final Answer:

    FastAPI raises a 404 Not Found error automatically -> Option A

  4. Quick Check:

    Missing file triggers 404 error [OK]
Quick Trick: Nonexistent file in FileResponse causes 404 [OK]
Common Mistakes:
MISTAKES
  • Expecting empty or corrupted file response
  • Assuming server creates missing files
  • Thinking response status is 200 with no content

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