补充关于 HTTPS 的说明

Software/Application/Caddy/Caddy_的使用.md

@@ -86,3 +86,19 @@ Caddyfile 文件内容如下
     index index.html
 }
 ```
+
+## HTTPS
+
+TLS 必须满足以下要求才能保证 HTTPS 功能正常：  
+
+* The hostname:
+  * is not empty
+  * is not localhost
+  * is not an IP address
+  * has no more than 1 wildcard (*)
+  * wildcard must be left-most label
+* The port is not explicitly 80
+* The scheme is not explicitly http
+* TLS is not turned off in site's definition
+* Certificates and keys are not provided by you
+* Caddy is able to bind to ports 80 and 443 (unless you use the DNS challenge)