RequestTracker class Null safety

Class used to track network requests.

try {
   final tracker = await RequestTracker.create(url);

   // optional: add server correlation headers
   final headers = await RequestTracker.getServerCorrelationHeaders();

   // use your custom request() implementation
   final response = await request(url, headers);

   await tracker.setRequestHeaders(response.request.headers);
   await tracker.setResponseHeaders(response.headers);
   await tracker.setResponseStatusCode(response.statusCode);
   await tracker.setUserDataBool("secureCheck": false);
 } catch (error) {
   await tracker.setError(error.toString());
 } finally {
   await tracker.reportDone();
 }