Www.example.com 正常，但 example.com 不行

[merefield (Robert)]

很可能不止这些。如果你使用 HTTPS（你应该这样做！），还需要处理 Let’s Encrypt 和代理才能让这一切正常工作。

参见：

Set up Let’s Encrypt with multiple domains / redirects

NOTE: @pfaffman says: This page needs to be cleaned up. There is now a new ENV setting that will let you add more hostnames. In your app.yml under your DISCOURSE_HOSTNAME line (it can go many places but that one makes sense), add DISCOURSE_HOSTNAME_ALIASES: domain.com,other.domain.com and early reports suggest that you’ll get valid certs for those domains and that accessing https://domain.com will properly redirect you to your DISCOURSE_HOSTNAME without a certificate error. If you do that an…

如果我是你，我会保持简单，只使用一个域名。