如何在 Python 的 aiohttp 中发送文件和表单数据？

Question

我有一个用例将从客户端（前端/邮递员）接收到的文件和其他表单数据发送到文件上传服务以上传文件。为此，我使用

aiohttp

。在请求正文中发送时我遇到了几个问题。

# View

from fastapi import APIRouter, Request
from app.services.file_upload_service import FileUploadClient

file_upload_router = APIRouter(prefix="/file_upload")


@file_upload_router.post("/")
async def upload_files(request: Request):
    req = await request.form()
    file = req._dict.get("file") # type --> <class 'tempfile.SpooledTemporaryFile'>
    response = await FileUploadClient.upload_file(file)
    return Response(...)

# util

class FileUploadClient(someClass):
    ...

    ...

    @classmethod
    async def upload_file(cls, file):
        if not file:
            return None

        url = "endpoint_to_file_upload_service"
        file_name = file.filename
        data_dict = {'file_name': file_name, 'form_data_key1': 'val1', 'form_data_key2': 'val2'}
        formdata = aiohttp.FormData()
        for key, value in data_dict.items():
            formdata.add_field(key, value)
        formdata.add_field('file', file.file)
        print(type(file.file))
        auth = await cls.get_auth() # This is BasicAuth: aiohttp.BasicAuth(username, password)
        async with aiohttp.ClientSession() as session:
            async with session.request("post", url, data=formdata, auth=auth, timeout=5) as response:
                resp = await response.json()
                print(resp)
                return resp

这会引发错误：

{'detail': 'Unsupported media type "application/x-www-form-urlencoded" in request.'}

当保持标题为 NULL 时，

当在标题中发送

application/json

作为

content-type

时，它正在抛出

{'detail': 'Unsupported media type "application/json" in request.'}

当我发送从客户端接收到的相同标头时，上述问题就消失了，但在文件上传服务中接收到的正文为空正文。

我该如何解决这个问题？