We are getting 200 status with type xhr when page is loaded first time.
However, if we refresh the same page again that time we are getting 200 status with type gif.
We have passed list variable,conversion variable and traffic variable on pageload using adobe launch.
Please refer below screenshot.
Both xhr and gif work just fine. Which one is used depends on the amount of data that AppMeasurement needs to send to AA's servers. As long as you're getting HTTP 200 status with either of them, you're all good.