拿一个beego的nginx配置文件给你参考，大概原理是除了指明URL里带有的css,js,fonts,img字符的nginx接管，如果文件不存在都转发到后端请求，相当于GO开启的web服务器

server {
    listen       80;
    server_name  .a.com;

    charset utf-8;
    access_log  /home/a.com.access.log;

    location /(css|js|fonts|img)/ {
        access_log off;
        expires 1d;

        root "/path/to/app_a/static";
        try_files $uri @backend;
    }

    location / {
        try_files /_not_exists_ @backend;
    }

    location @backend {
        proxy_set_header X-Forwarded-For $remote_addr;
        proxy_set_header Host            $http_host;

        proxy_pass http://127.0.0.1:8080;
    }
}