post method
      
  
Future<DohResponse> 
post(
    
    
- String url,
- Map<String, dynamic> headers,
- String body,
- DohProvider dohProvider,
override
    Implementation
@override
Future<DohResponse> post(String url, Map<String, dynamic> headers,
    String body, DohProvider dohProvider) async {
  return await makeRequest(
    method: 'makePostRequest',
    request: {
      'url': url,
      'headers': headers,
      'body': body,
      "dohProvider": dohProvider.toString()
    },
  );
}