How to make multiple url by AWS IP address in Nginx server

Question

As I have to maintain multiple web application I need to have different url. Also domain name yet not Decide from our company. So I have to use IP address for different hosted web application in AWS. I know in apache its quit easy. But I have to use Nginx server for this.

I hosted my all Laravel web application in var/www/html/ folder Like

var/www/html/app1 
var/www/html/app2
var/www/html/app3

And I want to make url like

Ip-address/app1
Ip-address/app2
Ip-address/app3

I already edit etc/nginx/sites-enabled/default

Make

location /app1 {
        root var/www/html/app1/public;
}
location /app2 {
        root var/www/html/app2/public;
}
location /app3 {
        root var/www/html/app3/public;
}

But nothing happen. Its return 404. nginx not changing the root directory.