把下载的Godaddy SSL文件中的两个crt合并为一个crt：

cat example.crt bundle.example.crt >> domain.crt

在Nginx的domain.conf中添加以下代码：

server {
    listen 80 default_server;
    listen [::]:80 default_server;
    return 301 https://$host$request_uri;
}
server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name example.com;
    ssl_certificate /etc/nginx/certs/ssl_certificate.crt;
    ssl_certificate_key /etc/nginx/certs/ssl_certificate.key;
    return 301 https://www.example.com$request_uri;
}
server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name www.example.com;
    ssl_certificate /etc/nginx/certs/ssl_certificate.crt;
    ssl_certificate_key /etc/nginx/certs/ssl_certificate.key;
    location / {
		proxy_pass http://127.0.0.1:3000/;
    }
}

在Laravel开启SSL

在App\ProvidersAppServiceProvider的boot方法中添加以下代码：

URL::forceScheme('https'); 

在laravel .env更改APP_URL的值=https://example.domain.com

APP_URL=https://example.domain.com