FastAPI - File Handling
What will be the response content type when a FastAPI endpoint returns the filename of an uploaded file received as UploadFile?
What will be the response content type when a FastAPI endpoint returns the filename of an uploaded file received as UploadFile?
medium📝 component behavior Q4 of 15
Step-by-Step Solution
Solution:
Step 1: Understand FastAPI default response type
FastAPI returns application/json by default for dict or JSON responses.Step 2: Returning filename as string
Returning the filename as a string will be sent as text/plain, but returning a dict with filename key returns application/json.Final Answer:
application/json -> Option AQuick Check:
Response content type for dict response = B [OK]
Quick Trick: FastAPI returns application/json by default for dict responses [OK]
Common Mistakes:
MISTAKES- Expecting text/plain for dict response
- Confusing multipart/form-data with response type
- Assuming application/octet-stream for filename string
Master "File Handling" in FastAPI
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