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  Future setInterests(String token, List<String> interests) {
    return _netUtil.post(BASE_URL + "/setinterests", body: {
      "token": token,
      "interests": interests
    }).then((dynamic res) {
      return res;
Passing _filters always throws the error:
type 'List<String>' is not a subtype of type 'String' in type cast
I don't know what else dart wants from me.
                Check whether token is of type string too. Also try to define _filters with var instead of List<String> and remove <String>. That should be enough for most purposes in Dart.
– Bostrot
                Jun 29, 2018 at 22:06
                Checked. token is a string. It comes from final token = prefs.getString('token');. Changing to var doesn't fix it. The thing is, the error message makes absolutely no sense, so debugging is vague to even begin with
– KhoPhi
                Jun 30, 2018 at 0:45
                Using var throws this back type 'List<dynamic>' is not a subtype of type 'String' in type cast.
– KhoPhi
                Jun 30, 2018 at 0:48
                Are you sure that body can take in List's? It looks like it is trying to cast it to a String to me, which obviously does not work.
– creativecreatorormaybenot
                Jun 30, 2018 at 7:39
I found the answer. I just added .toString() to the _filters List.
  this.api.setInterests(token, _filters.toString())
  .then((res) {
    print(res);
                Good to hear that you solved your issue. I was just writing a comment as a friendly reminder. :)  First of all,  List<String> _filters = <String>[8, 11]; this part is giving an error.  This will give us a error below. ` error: The element type 'int' can't be assigned to the list type 'String'. ` I would fix the array the array issue too.
– salihgueler
                Jun 30, 2018 at 11:42
You need to add  json.encode(data) in body
Add these two header 

'Content-type': 'application/json',

  'Accept': 'application/json',
Create map of your data
final Map<String, dynamic> data = new Map<String, dynamic>();
 data['token'] = token;
 data['interests'] = interests;
Call api like this 

http.post(url,<br>
body: json.encode(data),
headers: { 'Content-type': 'application/json',
  'Accept': 'application/json'},
encoding: encoding)
.then((http.Response response) {
     // print(response.toString());
        
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