onRequest method
Called when the request is about to be sent.
Implementation
@override
void onRequest(RequestOptions options, RequestInterceptorHandler handler) {
options.queryParameters.addAll({
'alternatives': true,
'geometries': 'polyline6',
'overview': 'simplified',
'steps': true,
'language': Environment.language,
'access_token': Environment.mapboxApiKey,
});
super.onRequest(options, handler);
}