nginx同一个端口支持http和https吗，不用强跳转的方法

nginx同一个端口支持http和https吗，不用强跳转的方法，内网访问http访问继续走http,外网访问http和https访问走https。各位大神指点一下

#user nobody;
worker_processes 1;


#error_log logs/error.log;
#error_log logs/error.log notice;
#error_log logs/error.log info;


#pid logs/nginx.pid;




events {
worker_connections 1024;
}




http {
include mime.types;
default_type application/octet-stream;


#log_format main '$remote_addr - $remote_user [$time_local] "$request" '
# '$status $body_bytes_sent "$http_referer" '
# '"$http_user_agent" "$http_x_forwarded_for"';


#access_log logs/access.log main;


sendfile on;
#tcp_nopush on;


#keepalive_timeout 0;
keepalive_timeout 65;


#gzip on; 
server {
listen 80;
listen 443 ssl;
server_name localhost;


#charset koi8-r;


#access_log logs/host.access.log main;
ssl_certificate certificate.crt;
ssl_certificate_key privatekey.key;
location / {
            root   html;
            index  index.html index.htm;
        }

#error_page 404 /404.html;


# redirect server error pages to the static page /50x.html
#
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root html;
}


# proxy the PHP scripts to Apache listening on 127.0.0.1:80
#
#location ~ \.php$ {
# proxy_pass http://127.0.0.1;
#}


# pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
#
#location ~ \.php$ {
# root html;
# fastcgi_pass 127.0.0.1:9000;
# fastcgi_index index.php;
# fastcgi_param SCRIPT_FILENAME /scripts$fastcgi_script_name;
# include fastcgi_params;
#}


# deny access to .htaccess files, if Apache's document root
# concurs with nginx's one
#
#location ~ /\.ht {
# deny all;
#}