1  Future<HttpClientResponse> foo() async {
2    Map<String, dynamic> jsonMap = {
3      'homeTeam': {'team': 'Team A'},
4      'awayTeam': {'team': 'Team B'},
5    };
6    String jsonString = json.encode(jsonMap); // encode map to json
7    String paramName = 'param'; // give the post param a name
8    String formBody = paramName + '=' + Uri.encodeQueryComponent(jsonString);
9    List<int> bodyBytes = utf8.encode(formBody); // utf8 encode
10    HttpClientRequest request =
11        await _httpClient.post(_host, _port, '/a/b/c');
12    // it's polite to send the body length to the server
13    request.headers.set('Content-Length', bodyBytes.length.toString());
14    // todo add other headers here
15    request.add(bodyBytes);
16    return await request.close();
17  }
18

1  Map<String, String> body = {
2    'name': 'doodle',
3    'color': 'blue',
4    'homeTeam': json.encode(
5      {'team': 'Team A'},
6    ),
7    'awayTeam': json.encode(
8      {'team': 'Team B'},
9    ),
10  };
11
12  Response r = await post(
13    url,
14    body: body,
15  );
16