sendMessage method
Отправка нового сообщения.
Implementation
Future<SjMessageDto> sendMessage(SjMessageSendsDto msg) async {
final result = await $httpPost(urls.apiMsgSend, {
'msg': msg.toJson(),
});
if (!result.containsKey('msg')) {
throw const FormatException('invalid response');
}
final res = result['msg'] as Map;
return SjMessageDto.fromJson(res);
}