python: 使用http方式调用pb协议

async def call_proto_http(url, req):
    try:
        data = req.SerializeToString()
        length = len(data)
    except Exception as e:
        pass
    headers = {'Content-type': 'application/x-protobuf',
               'Content-Length': str(length)}

    async with aiohttp.ClientSession() as session:
        async with session.post(url, timeout=10, data=data, headers=headers) as response:
            # logging.debug('post_json url {}, data {}'.format(url, data))
            status = response.status
            content = await response.read()
            logging.debug(
                "call_proto_http url:{}, status:{}, content:{}".format(url, status, content))
            return status, content

async def test_upload_file(file_name, file_bytes):
    f = FileDataRequest() # 这个是pb对象
    f.FileName = file_name
    f.FilePath = ""
    f.FileContent = file_bytes
    f.FileMd5 = ""

    url = "http://127.0.0.1:3001/Upload"
    status, content = await call_proto_http(url, f)
    rsp = FileDataResponse()
    rsp.ParseFromString(content) # 返回的content用另外一个Pb对象反序列化，完美
    return rsp.Code, rsp.ErrMsg, rsp.FilePat