[Arxiv] The website cannot be opened

The original access address provided by Cornel University: https://arxiv.org
The address of the mirror image of the Chinese Academy of Sciences: cn.arxiv.org
Note that there is no http: // in front, otherwise it will not open.
After finding the article on the original website, you can replace http: // with cn. For
example: cn.arxiv.org/pdf/1710.06081v2