mutipart/form-data not working on TestClient

[cln-m4rie]

from fastapi import APIRouter, File, Form, UploadFile

router = APIRouter()

@router.post("/upload", response_model=MyResponseModel, summary="user csv upload api")
async def upload(
    user_id: int = Form(..., example=1),
    csv_file: UploadFile = File(...),
):
    """
    some code...
    """

I checked on swagger(/docs). It was successful.

but, failed in test code

from myapp import app

class UploadTest(unittest.TestCase):
    client = TestClient(app)

    def test_upload(self):
        with csv.open("rb") as f:
            filebody = f.read()
        res = self.client.post(
            "/api/upload",
            data={
                "user_id": 1
            },
            files={
                "csv_file": ("filename.csv", filebody),
            },
            headers={"Content-Type": "multipart/form-data"})
        self.assertEqual(status.HTTP_200_OK, res.status_code)
        MyResponseModel.parse_obj(res.json()["data"])

Error getting request body: can't concat NoneType to bytes
{'detail': 'There was an error parsing the body'}

[marodev]

It's not an issue related to FastAPI.

Requests sets the content-type header automatically if you use files.

Thus, delete: headers={"Content-Type": "multipart/form-data"}

Otherwise, you may have to deal with boundary (Content-Type: multipart/form-data;boundary="boundary") which is not what you want :)

[cln-m4rie]

@marodev

delete: headers={"Content-Type": "multipart/form-data"}

Thank you!

It's successful 🎉

[tiangolo]

Thanks for the help here @marodev ! 👏 🙇

Thanks for reporting back and closing the issue @cln-m4rie 👍