nginx 80端口重定向到443端口，也就是http访问自动跳转到https 

配置如下： 
一、按照如下格式修改nginx.conf 配置文件，80端口会自动转给443端口，这样就强制使用SSL证书加密了。访问http的时候会自动跳转到https上面。

server {
    listen 80;
    server_name www.域名.com;
    rewrite ^(.*)$ https://${server_name}$1 permanent; }server {
    listen 443;
    server_name www.域名.com;
    root /home/wwwroot;
    ssl on;
    ssl_certificate /etc/nginx/certs/server.crt;
    ssl_certificate_key /etc/nginx/certs/server.key;
    ....
}1234567891011121314

备注： ${server_name}可以换成$host

二、重启nginx。

三、示例(以下是我们生产的配置)

server {
    listen 80;
    server_name www.test.com;
    rewrite ^(.*)$ https://${server_name}$1 permanent; }

server {
    listen 443;
    server_name www.test.com;
    ssl on;
    ssl_certificate   /etc/pki/CA/certs/214321311540956.pem;
    ssl_certificate_key  /etc/pki/CA/certs/214321311540956.key;
    ssl_session_timeout 5m;
    ssl_ciphers ECDHE-RSA-AES128-GCM-SHA256:ECDHE:ECDH:AES:HIGH:!NULL:!aNULL:!MD5:!ADH:!RC4;
    ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
    ssl_prefer_server_ciphers on;   
    index index.php index.htm index.html;
    error_page 404 /404.html;
    error_page 500 502 503 504 /50x.html;

    location ~ \.php {
    root /alidata/www/html;
    fastcgi_pass unix:/tmp/php-cgi.sock;
    fastcgi_index index.php;
    include   fastcgi.conf;    set $path_info "";    set $fastcgi_script_name_new $fastcgi_script_name;        if ($fastcgi_script_name ~*   "^(.+\.php)(/.+)$"  ) {            set $fastcgi_script_name_new $1;        set $path_info $2;
    }

    fastcgi_param   SCRIPT_FILENAME   $document_root$fastcgi_script_name_new;
    fastcgi_param   SCRIPT_NAME   $fastcgi_script_name_new;                    
    fastcgi_param   PATH_INFO $path_info;
    }

    location / {
    root /alidata/www/html;
    index index.php index.html index.htm;    if (!-e  $request_filename){
        rewrite ^(.*)$ /index.php$1 last;
    }
  }
}