Dart: HTTP GET with Header

Question

I'm working on creating a Flutter application that works with LIFX. I'm trying to follow their instructions here, but I'm having issues adding a header to my HTTP GET request.

TestHttpGet() async {
  var httpClient = new HttpClient();
  var header = "Bearer $token"; //token hidden
  var url = 'https://api.lifx.com/v1/lights/all/state';

  String result;
  try {
    var request = await httpClient.getUrl(Uri.parse(url));
    request.headers.set("Authorization", header);
    var response = await request.close();
    if (response.statusCode == HttpStatus.OK) {
          var json = await response.transform(UTF8.decoder).join();
          print(json);
          var data = JSON.decode(json);
          result = data['brightness'].toString();
        } else {
          result =
              'Error getting response:\nHttp status ${response.statusCode}';
        }
      } catch (exception) {
        result = 'Failed parsing response';
      }

This returns with Error getting response: Http status 404. I've tried various ways of request.headers .set .add [HttpHeaders.Authorization] = "header" all return with a 404. Any advice would be appreciated.

I believe the authorization header should be lower case, and either set or add will work. Otherwise it seems like you might be having a problem with the API key. — Jonah Williams
– Jonah Williams, Commented Mar 11, 2018 at 1:08
Using cURL Authorization works, I tried using authorization in Flutter and that unfortunately didn't work. — Altkey
– Altkey, Commented Mar 11, 2018 at 6:05
This will work -> http.get(url, headers:{"Authorization":"value"}).then(.....) — Daksh Gargas
– Daksh Gargas, Commented Aug 25, 2018 at 11:42

Marcel · Accepted Answer · 2019-06-25 16:19:51Z

11

You can pass a Map<String, String> to the http.get call as the headers parameter like this:

await httpClient.get(url, headers: {
  'Authorization': 'Bearer $token',
});

answered Jun 25, 2019 at 16:19

Marcel

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1 Comment

Martin Kersten Over a year ago

Also makes it lower case. I have the same issue. Putting in 'Authorization' results in lower caps 'authorization being written. By the way you can use the url: postman-echo.com/headers to get all the headers as the server sees it as a json response

Goddard · Accepted Answer · 2022-06-22 19:01:38Z

1

In order to set headers you can't set the entire variable since it is set as final. What you need to do is set the value of the individual array items which are also known as the individual "headers" in this case.

For example :

http.Request request = http.Request('GET', uri);
request.headers['Authorization'] = 'Bearer $token';

answered Jun 22, 2022 at 19:01

Goddard

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Comments

Community · Accepted Answer · 2021-10-07 13:35:05Z

0

I believe dart makes all the fields of a HttpHeader to lowercase.

https://github.com/flutter/flutter/issues/16665

The argument for that is because "Field names are case-insensitive". (otherwise it is not HTTP compliant)

https://www.rfc-editor.org/rfc/rfc2616#section-4.2

Let me know if you found a workaround for this.

edited Oct 7, 2021 at 13:35

CommunityBot

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answered Jul 8, 2019 at 15:08

Durdu

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