Question 75016 in Flutter Question posted in
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API returning Error 406 when sending files – Flutter

I’m developing my own API to receive files and using Flutter to create the app.

So I’m sending files to and API, using Flutter Dio, and I keep getting error 406.

'file': await MultipartFile.fromFile(file.path),

Turns out, I found out if I add the following line, it works:

'file_tar': await MultipartFile.fromFile(file.path, contentType: MediaType('application', 'x-tar')),

To work, both lines must be on the code.

On PHP web, the same thing, but I couldn’t find a workaround.

Funny thing, using the same API on Postman, and over there it doesn’t require this line, so I guess this might be Flutter Dio encoding the file somehow, requiring the x-tar Content-Type for the file.

Here is the entire Flutter code:

var dio = Dio();
var formData = FormData.fromMap({
  'file': await MultipartFile.fromFile(file.path),
  'file_tar': await MultipartFile.fromFile(file.path, contentType: MediaType('application', 'x-tar')),
});
var response = await dio.post(url,
    data: formData,
    options: Options(headers: {
      'Content-Type': 'multipart/form-data; charset=utf-8',
      'Accept': '*/*',
      'Connection': 'keep-alive',
      'Accept-Encoding': 'gzip, deflate, br',
    }), onSendProgress: (int sent, int total) {
  var progress = (sent / total) * 100;
  log('Progress: $progress %');
});

Thanks!!!

Tags:

2

Answers


  1. 0

    You can try this way also. It might help you.

    var dio = Dio();
var formData = FormData();

 formData.files.addAll([
  MapEntry("file", await MultipartFile.fromFile(file)),
   MapEntry("file_tar", await MultipartFile.fromFile(file ,contentType: MediaType('application', 'x-tar') )),
]);

var response = await dio.post(url,
    data: formData,
    options: Options(headers: {
      'Content-Type': 'multipart/form-data; charset=utf-8',
      'Accept': '*/*',
      'Connection': 'keep-alive',
      'Accept-Encoding': 'gzip, deflate, br',
    }), onSendProgress: (int sent, int total) {
  var progress = (sent / total) * 100;
  log('Progress: $progress %');
});

    OR

    formData.files.addAll([
  MapEntry(
   'file',
    MultipartFile.fromFileSync(file.path,filename: 'upload.test'),
  ),
  MapEntry(
    'file_tar',
    MultipartFile.fromFileSync(file.path,filename: 'upload.test'),
  ),
]);

    file_tar is your key then its fine. otherwise you can just write files as in the end its creates array of files.

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  2. 0

    Might be content-type issue. Try this code:

    import 'dart:io';
import 'package:dio/dio.dart';
import 'package:http_parser/http_parser.dart';

// ...

var dio = Dio();
var formData = FormData.fromMap({
  'file': await MultipartFile.fromFile(
    file.path,
    contentType: MediaType('application', 'octet-stream'),
  ),
});
var response = await dio.post(url,
    data: formData,
    options: Options(headers: {
      'Content-Type': 'multipart/form-data; charset=utf-8',
      'Accept': '*/*',
      'Connection': 'keep-alive',
      'Accept-Encoding': 'gzip, deflate, br',
    }), onSendProgress: (int sent, int total) {
  var progress = (sent / total) * 100;
  print('Progress: $progress %');
});
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