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.

Answer 1

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',
});

Answer 2

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.

Answer 3

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';