第一步
默认情况下，apache的80端口网站目录是/var/www/html
查找配置文件并修改/etc/httpd/conf/httpd.conf
利用伪静态功能
<Directory "/var/www/html">
Possible values for the Options directive are "None", "All",
or any combination of:
Indexes Includes FollowSymLinks SymLinksifOwnerMatch ExecCGI MultiViews
Note that "MultiViews" must be named explicitly --- "Options All"
doesn't give it to you.
The Options directive is both complicated and important. Please see
http://httpd.apache.org/docs/2.2/mod/core.html#options
for more information.
Options Indexes FollowSymLinks
AllowOverride controls what directives may be placed in .htaccess files.
It can be "All", "None", or any combination of the keywords:
Options FileInfo AuthConfig Limit
AllowOverride All #原来是None，需要改成All
Controls who can get stuff from this server.
Order allow,deny
Allow from all
</Directory>
第二步
然后在需要跳转的网站根目录，也就是80端口的网站根目录/var/www/html下创建一个.htaccess文件，如果目录下已经有.htaccess文件，则用vi或者其他编辑器打开，在最下面添加写入如下语句即可
RewriteEngine on
RewriteBase /
RewriteCond %{SERVER_PORT} !^443$
RewriteRule ^.*$ https://%{SERVER_NAME}%{REQUEST_URI} [L,R]
保存，重启httpd服务，再次访问http://域名，发现会直接跳转到https://域名
配置成功。
