Unable to add header for post method in dio in Flutter

Question

I'm using dio: ^3.0.4. Any one please help me to find the solution for adding header. here my code:

FormData formData = 
    new FormData.fromMap({"files": await MultipartFile.fromFile(filePath.path, filename: 'photo')
          });

  Response response = await dio.post("***********",
    data: formData,
    onSendProgress: (int sent, int total) {
      print("$sent $total");
    },
    options: Options(
      headers: {
        "authorization": "*************"
      },
      followRedirects: false,
      validateStatus: (status) {
        return status <= 500;
      }
    ),
  );

When i print the header.

print(response.headers);

Result:

flutter: content-type: text/html; charset=UTF-8 connection: close cache-control: no-cache, private transfer-encoding: chunked date: Thu, 07 Nov 2019 14:29:02 GMT server: Apache/2.4.18

You are printing the response headers, which look basically correct for response headers. What are you trying to print? — Richard Heap, Nov 07 '19 at 15:43
@RichardHeap I try to add authorization key into header, but when i send to the server, The server can not get the header of authorization. — Vexal, Nov 08 '19 at 03:05
Check that your server accepts the header name `authorization` in lower case. Dart will typically lower case all header name. Use Postman to confirm that a lower case header name works. — Richard Heap, Nov 08 '19 at 12:42
Just found the problem with server side checking header. It's not work with `apache_request_headers()` on **Laravel**, need to use `req->request();`. — Vexal, Nov 14 '19 at 03:19
It's probably best to delete this question, as the solution is not actually related to the question. Your Dart code turned out to be correct. — Richard Heap, Nov 14 '19 at 09:53

Dharmesh Mansata · Answer 1 · 2019-11-08T05:31:34.273

43

Dio library key working perfectly fine in my case if we pass small case key value

For example,

Dio dio = new Dio();
dio.options.headers['content-Type'] = 'application/json';
dio.options.headers["authorization"] = "token ${token}";
response = await dio.post(url, data: data);

make sure you write key in small case, that's work for me.

edited Nov 08 '19 at 05:31

answered Nov 08 '19 at 05:14

Dharmesh Mansata

4,422
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2

It's not necessary to write the keys in **small case**. It is just case sensitive. – Aryeetey Solomon Aryeetey May 19 '20 at 09:22
I am adding header in interceptors but now the request in not forwarding any more. – Faizan Mubasher Apr 07 '21 at 15:05

score 17 · Answer 2 · edited Sep 23 '21 at 00:20

17

In case of you use di in your projects and the dioclient is a singleton, this is how authorization is added to the call.

final response = await _dioClient.get(Endpoints.getDashboard,
          queryParameters{'shopId':int.parse(shopId)},
          options: Options(
            headers: {
              "authorization": "Bearer <your token>",
            },
          ),
        );

edited Sep 23 '21 at 00:20

Monasha

882
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17

answered Sep 01 '21 at 18:43

Jashan PJ

4,177
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chunhunghan · Answer 3 · 2019-11-08T05:07:36.850

16

There are some similar questions do not have answer
But the following work for me
Please use the following code snippet to set headers attribute

  Dio dio = new Dio();
  dio.options.headers["Authorization"] = "Bearer ${token}";
  response = await dio.post(url, data: data);

edited Nov 08 '19 at 05:07

answered Nov 08 '19 at 04:10

chunhunghan

51,087
5
102
120

How to do the same thing when authorization is done using API key instead of token? @chunhunghan – Nadeem Shaikh May 17 '22 at 10:38

score 2 · Answer 4 · answered Apr 02 '20 at 12:01

2

This work for me after try differents ways to pass the argument to headers

    Dio dio = new Dio();
    dio.options.contentType = ContentType("application","x-www-form-urlencoded");
    dio.options.headers[HttpHeaders.authorizationHeader] ="Basic $clientCredentials";

answered Apr 02 '20 at 12:01

Ale Marquitti

79
3

2

`The argument type 'ContentType' can't be assigned to the parameter type 'String'.` – BartusZak Feb 13 '21 at 16:11

score 1 · Answer 5 · answered Feb 13 '21 at 17:46

1

That's probably bug because I was not able to set it with lowercase content-type.

Content-Type works.

options.headers = {'Content-Type': 'application/json', ...request.headers};

Feel free to refer to https://github.com/flutterchina/dio/issues/1045

answered Feb 13 '21 at 17:46

BartusZak

1,041
14
21

score 0 · Answer 6 · edited Jul 26 '21 at 23:18

0

dio.options.contentType = ContentType("application","x-www-form-urlencoded") as String;

edited Jul 26 '21 at 23:18

Mol0ko

2,938
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answered Jul 26 '21 at 05:41

LAUKENDRA SINGH

1
1

score 0 · Answer 7 · answered May 20 '22 at 05:56

I'm using it like this:

_dio = Dio();
_dio.options.baseUrl = _baseUrl;
_dio.options.connectTimeout = 5000; //5s
_dio.options.receiveTimeout = 3000;
_dio.options.contentType = 'application/json';
_dio.options.headers['Content-Type'] = 'application/json';
_dio.options.headers["Authorization"] = "Bearer 284|NRx1PaEY2HbwHi2XMzGdxg9UJ5rGXkNMcYyNXkqH";
_dio.options.followRedirects = false;
_dio.options.validateStatus = (status) {
  return status! < 500;
};

Unable to add header for post method in dio in Flutter

7 Answers7

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