How do you add this kind of query parameters to a Dart http request?

Question

How do you correctly add this kind of query parameters to a Dart http get request. This is my code

String? token;
  String? baseUrl = 'vps';
  String? path = 'web/session';

Map<String, dynamic> query ={
      "jsonrpc": "1.0",
      "method": "call",
      "id": "2",
      "params": {
        "login": username,
        "password": password,
        "db": "dev.sf.com",
        "context": {}
      }
    };

Uri uri = Uri.http(baseUrl.toString(), '$path/$endPath');
    if (query != null) {
      uri = Uri.http(baseUrl.toString(), '$path/$endPath', query);
    }
    return http.get(uri, headers: {
      'Authorization': 'Bearer $token',
      'Accept': 'application/json',
    });

but i get this error

 [ERROR:flutter/lib/ui/ui_dart_state.cc(198)] Unhandled Exception: type '_InternalLinkedHashMap<String, Object>' is not a subtype of type 'Iterable<dynamic>'

See the documentation for the [`Uri` constructor](https://api.dart.dev/stable/dart-core/Uri/Uri.html), which applies to its other constructors as well: "When `queryParameters` is used ... A value in the map must be either a string, or an `Iterable` of strings..." The values for the `"params"` key cannot be a nested `Map`. — jamesdlin, Aug 27 '22 at 21:37
on this line ```uri = Uri.http(baseUrl.toString(), '$path/$endPath', query);``` — alabiboo, Aug 27 '22 at 21:37
Does this answer your question? [How do you add query parameters to a Dart http request?](https://stackoverflow.com/questions/52824388/how-do-you-add-query-parameters-to-a-dart-http-request) — Robert Sandberg, Aug 27 '22 at 21:41
@jamesdlin the api i am using forces me to use the param key with nested Map — alabiboo, Aug 27 '22 at 21:45
@RobertSandberg there is a difference in the param key in my code — alabiboo, Aug 27 '22 at 21:48
And how does the API expect the nested map to be encoded to the URL? Examples, please. Are you sure these should be *query* parameters, which get encoded into the URL? — jamesdlin, Aug 27 '22 at 21:49

score 1 · Answer 1 · answered Aug 27 '22 at 21:24

Try to send primitive types like int, string, boolean, etc. You send a Map as "params", this shouldnt work.

Map<String, dynamic> query ={
      "jsonrpc": "1.0",
      "method": "call",
      "id": "2",
      "login": username,
      "password": password,
      "db": "dev.sf.com",
    };

Alternative (and better imo): Make a post request and send it inside the body.

How do you add this kind of query parameters to a Dart http request?

1 Answers1