如何从http重定向到https：
1. redirect http://example.com to https://www.example.com
2. redirect http://www.example.com to https://www.example.com
3. redirect https://example.com to https://www.example.com
像脸书、谷歌？
请帮助我处理.htaccess或其他代码。
只需在下面添加到您的.htaccess中即可
RewriteEngine On
RewriteCond %{HTTPS} !on
RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI}
要在单个规则中处理所有这 3 个重定向，您可以在DOCUMENT_ROOT/.htaccess文件中使用以下代码：
RewriteEngine On
RewriteCond %{HTTP:CF-Visitor} '"scheme":"http"' [OR]
RewriteCond %{HTTP_HOST} ^example'.com$ [NC]
RewriteRule ^ https://www.example.com%{REQUEST_URI} [NE,R=301,L]
RewriteCond %{HTTP:CF-Visitor} '"scheme":"http"'
RewriteRule ^ https://%{HTTP_HOST}%{REQUEST_URI} [NE,R=301,L]
RewriteEngine On
# ensure www.
RewriteCond %{HTTP_HOST} !^www'. [NC]
RewriteRule ^ https://www.%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
# ensure https
RewriteCond %{HTTP:X-Forwarded-Proto} !https
RewriteCond %{HTTPS} off
RewriteRule ^ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]