Yes, it works now. Thank you!
Update
After setting google chrome “Network – Disable Cache – Reload (Empty cache and Hard Reload)”, all status turns to HIT. So I guess the 2nd question is resolved. The thing I don’t understand is, I have purged all after every setting, and the visitor page also gets update, why the cf-cache-status was Miss instead of Hit. I used incognito mode to check this every time, it was always Miss, only this time after above actions, it shows Hit.
