Some pictures could not be reachable from browser while we cache them with CDN of CF.
We use CDN feature of CF for our website, both pc and mobile versions. For some static files, like images, the files for both pc and mobile versions are located in the same uri and share the same name, but with different size, while the domain for pc and mobile versions are the same.
Let me take an instance. Users want to visit a pic with url like https://www.xxx.com/pic/example.jpg, they could visit it both on pc and mobile phones but actually goes to different location on the server side. And now it often happens that we could not get the pics from the browsers.