Wordpress Multisite with subdirectory setup - nginx conf

nginx.conf

# For wordpress multisite networks with sub-directory installs
# nginx.conf
server {
    listen       80;
    listen  [::]:80;

    server_name  example.com;

    index index.php index.html index.htm;

    proxy_buffer_size 256k;
    proxy_buffers              4 512k;
    proxy_busy_buffers_size    512k;
    proxy_max_temp_file_size   0;

    proxy_read_timeout 600;
    proxy_connect_timeout 600;
    proxy_send_timeout 600;

    root /var/www/html-example;

    location = /favicon.ico {
        log_not_found off;
        access_log off;
    }

    location = /robots.txt {
        allow all;
        log_not_found off;
        access_log off;
    }

    location ~* /xmlrpc.php {
        deny all;
        return 404;
    }

    rewrite_log on;

    location ~* ^/sub_dir/ {
        try_files $uri $uri/ /sub_dir/index.php$is_args$args;

        if (!-e $request_filename) {
            rewrite /sub_dir/wp-admin$ $scheme://$host$uri/ permanent;
            rewrite /sub_dir(/[^/]+)?(/wp-.*) /sub_dir/$2 last;
            rewrite /sub_dir(/[^/]+)?(/.*\.php)$ /sub_dir$2 last;
            rewrite /sub_dir(/[^/]+)?(/[^/]+)?(/.*\.php)$ /sub_dir$2 last;
            rewrite /sub_dir(/[^/]+)? /sub_dir/ last;
        }

        location ~ ^/sub_dir(/[^/]+)(/wp-.*\.php) {
            rewrite /sub_dir(/[^/]+)?(/wp-.*\.php)$ /sub_dir$2 last;
        }

        location ~ \.php {
            include        fastcgi_params;
            fastcgi_pass    127.0.0.1:9000;
            fastcgi_split_path_info    ^(.+\.php)(/.+)$;
            fastcgi_index    index.php;
            fastcgi_hide_header X-Powered-By;

            fastcgi_param    SCRIPT_FILENAME /var/www/html-example/$fastcgi_script_name;
            fastcgi_param    PATH_INFO $fastcgi_path_info;
        }
    }

    location / {
        try_files $uri $uri/ /index.php?$args;
    }

    location ~* \.(?:ico|css|js|gif|jpe?g|png|svg|swf|ico|pdf|mov|fla|zip|rar)$ {
        expires max;
        log_not_found off;
        add_header Pragma public;
        add_header Cache-Control "public";
    }

    # Deny all attempts to access hidden files such as .htaccess, .htpasswd, .DS_Store (Mac).
    # Keep logging the requests to parse later (or to pass to firewall utilities such as fail2ban)
    location ~ /\. { deny all; }

    # Deny access to any files with a .php extension in the uploads directory
    # Works in sub-directory installs and also in multisite network
    # Keep logging the requests to parse later (or to pass to firewall utilities such as fail2ban)
    location ~* /(?:uploads|files)/.*\.php$ { deny all; }

    location ~ \.php$ {
        fastcgi_read_timeout 600;
        fastcgi_send_timeout 600;

        include         fastcgi_params;
        fastcgi_pass    127.0.0.1:9000;
        fastcgi_split_path_info ^(.+\.php)(/.+)$;
        fastcgi_index   index.php;
        fastcgi_hide_header X-Powered-By;
        fastcgi_param   SCRIPT_FILENAME $document_root$fastcgi_script_name;
        fastcgi_intercept_errors on;
        fastcgi_param   PATH_INFO $fastcgi_path_info;
    }
}