onRequest method
Called when the request is about to be sent.
Implementation
@override
void onRequest(RequestOptions options, RequestInterceptorHandler handler) {
debugPrint('');
debugPrint('# REQUEST');
final method = options.method.toUpperCase();
debugPrint('--> $method - ${options.uri}');
debugPrint('Headers: ${options.headers}');
debugPrint('Data: ${options.data}');
debugPrint('--> END $method');
return super.onRequest(options, handler);
}