abc.example.com

#upstream is from example.com
upstream example {
    ip_addr1;
}

#config for abc.example.com starts here
server {
        listen 443;
        server_name abc.example.com;
        root /var/www/test/public_html;
        index index.html index.htm;
        ssl on;
        ssl_certificate /etc/nginx/ssl/example.com.chained.crt;
        ssl_certificate_key /etc/nginx/ssl/example.key;

        location ~ ^/(css|js|api|img)/* {
                proxy_pass http://example;
        }

        location / {
                proxy_pass http://example/abc/;
                proxy_set_header X-Real-IP $remote_addr;
                proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
                proxy_set_header Host example.com;
                proxy_set_header X-NginX-Proxy true;

                proxy_http_version 1.1;
                proxy_set_header Upgrade $http_upgrade;
                proxy_set_header Connection "upgrade";

                sub_filter_once on;
                sub_filter /abc* /;
        }

}
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