onResponse method
Called after a response is received (any status code). You may call
handler.reject to convert a response into an error.
Implementation
@override
void onResponse(ResponseContext context, ResponseHandler handler) {
_log('← ${context.statusCode} ${context.request.uri}');
_log(' body: ${context.body.length > 500 ? '${context.body.substring(0, 500)}…' : context.body}');
handler.next(context);
}