为什么？？
<VirtualHost *:80> ServerAdmin [email protected] DirectoryIndex index.php <If "%{SERVER_PROTOCOL} != 'HTTPS'"> Redirect / https://www.mydomain.com:443/ </If> ..... </VirtualHost> 保存，然后重新启动：
sudo /etc/init.d/apache2 restart Syntax error on line 4 of /etc/apache2/sites-enabled/000-default: Invalid command '<If', perhaps misspelled or defined by a module not included in the server configuration Action 'configtest' failed. The Apache error log may have more information. ...fail!
“如果”不是Apache能够理解的（在版本2.3之前）。 你可能应该看看mod_rewrite
RewriteEngine On RewriteCond %{HTTPS} !=on RewriteRule ^/(.*) https://example.com:443/$1 [R,L]
要find你的apache版本，你可以使用： apache2 -v