How to Solve Empty File Upload Issues in FastAPI?-Python Tutorial-php.cn

How to Solve Empty File Upload Issues in FastAPI?

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Release： 2024-12-20 14:48:10

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How to Solve Empty File Upload Issues in FastAPI?

How to Upload File using FastAPI?

Problem:
When using FastAPI to upload a file according to the official documentation, the file2store variable remains empty.

Cause:

Ensure that python-multipart is installed.
When using def endpoints, you can use the .file attribute to access the actual Python file and call its methods synchronously.
When using async def endpoints, consider asynchronous file operations.
Adjust chunk size accordingly if files are too large for memory.

Solution:

app.py:

from fastapi import File, UploadFile

@app.post("/create_file")
def create_file(file: UploadFile = File(...)):
    try:
        contents = file.file.read()
        # store contents to the database
    except Exception:
        return {"message": "Error uploading file"}
    finally:
        file.file.close()
    return {"message": f"Successfully uploaded {file.filename}"}

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Alternative for Async Endpoints:

@app.post("/create_file")
async def create_file(file: UploadFile = File(...)):
    try:
        contents = await file.read()
        # store contents to the database
    except Exception:
        return {"message": "Error uploading file"}
    finally:
        await file.close()
    return {"message": f"Successfully uploaded {file.filename}"}

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Uploading Multiple Files:

from fastapi import File, UploadFile
from typing import List

@app.post("/upload")
def upload(files: List[UploadFile] = File(...)):
    for file in files:
        try:
            contents = file.file.read()
            # store contents to the database
        except Exception:
            return {"message": "Error uploading file(s)"}
        finally:
            file.file.close()
    return {"message": f"Successfully uploaded {[file.filename for file in files]}"}

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Request from Python Script:

requests.post(url="SERVER_URL/create_file", files={"file": (f.name, f, "multipart/form-data")})

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