postJson method
Implementation
Future<ApiResponse> postJson() async {
final Response response = await _dio!.request(_url,
data: _paramMap,
cancelToken: _cancelToken,
options: Options(
method: 'POST',
headers: _headerMap,
responseType: _responseType ?? ResponseType.plain,
contentType: "application/json",
followRedirects: true));
clearParams();
return ApiResponse(response);
}