1. After publishing a Weibo link to the platform via the Weibo Open Platform API, I clicked the web link on my homepage. See Figure 1.
2. When the link opened, it prompted: To browse, long-press the URL to copy it and use a browser to visit. See Figure 2.
3. The URL is: https://newstatic.szscmc.com/szaqjsyjy_html/66wblm/32459.shtml . It opens normally. See Figure 3.
4. I decided to manually publish a Weibo post based on this link in the Weibo backend. See Figure 4.
5. After publishing successfully, I clicked the web link. When the link opened, it prompted: To browse, long-press the URL to copy it and use a browser to visit. See Figure 5.
6. I decided to manually publish a Weibo post based on a link in the Weibo backend. However, the Weibo URL is: https://www.infoq.cn/article/HefCksLl0AgTagb7Aex1 . See Figure 6.
7. After publishing successfully, I clicked the web link. It can be opened directly without copying. See Figure 7.
8. I initially suspected this was related to the link itself. I decided to add the secure domain www.infoq.cn to the Weibo application. Then, I published a Weibo link to the platform via the Weibo Open Platform API. After publishing successfully, I clicked the web link. It can be opened directly without copying. See Figure 8.
9. The link that requires copying the URL: https://newstatic.szscmc.com/szaqjsyjy_html/66wblm/32459.shtml . The link that can be opened directly: https://www.infoq.cn/article/HefCksLl0AgTagb7Aex1 . This indicates that needing to copy the URL to open it is indeed related to the URL itself, and is independent of whether the publishing channel is the Weibo backend or the open API.
10. On July 8, 2020, Weibo started adopting an external link whitelist mechanism, providing free services only to whitelisted websites, such as government, news, and certified enterprise websites. It no longer supports redirection for URLs outside the whitelist. Reference URL: https://weibo.com/u/1934183965?is_all=1&is_search=1&key_word=%E9%93%BE%E6%8E%A5#_0 . See Figure 9.
11. Since applying for the whitelist takes some time, this analytical conclusion remains to be verified.