server {
    listen 443 ssl;
    server_name 域名;
    ssl_certificate   "ssl证书路径.crt";#如"/etc/nginx/cert/a.crt"
    ssl_certificate_key  "ssl证书路径.key";#如"/etc/nginx/cert/a.key"
    location /ws {
      proxy_pass http://127.0.0.1:监听端口;
      proxy_set_header Upgrade $http_upgrade;#重要，必须有
      proxy_set_header Connection "Upgrade";#重要，必须有
    }
}