在nginx转发后保持域名相同？

I have a setup that is presented below:

domain_name -> nginx_ip_address -> wordpress_blog_ip_address

Where when a user visits "/blog", nginx forwards the request to a seperate ip address of a machine running a wordpress blog.

The problem is that when the user clicks on a post in the blog, the url will show as: "wordpress_blog_ip_address/post" and not "domain_name/blog/post". How can I fix this?

My current nginx file is below:

server {
    location / {
        proxy_pass http://localhost:8000;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
    }

    location /blog {
    proxy_pass http://new_ip_address/;
      proxy_set_header Host $host;
    }
}

It might be that wordpress is configured to use wordpress_blog_ip_address/ as a absolute url, and all url wordpress return will start with wordpress_blog_ip_address/. To change this absolute url, in wp-config.php, set WP_SITEURL to be dynamically generated, i.e.:

define( 'WP_SITEURL', 'http://' . $_SERVER['SERVER_NAME'] . '/' );

and the same for WP_HOME, WP_CONTENT_URL, WP_PLUGIN_URL and other field containing absolute url. ( use search feature in your editor. )

Source: https://codex.wordpress.org/Editing_wp-config.php#WordPress_address_.28URL.29

Another way to do it is by forcing Wordpress to output relative URL by using Relative URL plugin.