Flutter iOS 应用程序：SocketException：操作系统错误：错误的文件描述符，errno = 9

Question

我的应用程序的多个 Flutter iOS 用户在发送上传图像的多部分请求时，在其应用程序中收到以下错误：

SocketException: OS Error: Bad file descriptor, errno = 9, address = <back-end server domain>, port = 64362

发送请求的代码

var request = http.MultipartRequest("POST", uri);
request.files.add(
await http.MultipartFile.fromPath(
 "images",
 imagePath,
 filename: imageName,
 ),
);
request.headers.addAll({
  "Content-type": "multipart/form-data",
});
var response = await request.send();
var response2 = await http.Response.fromStream(response);