Nginx proxy_pass to docker container doesn't work

I have two identiacal docker containers running on different ports on CentOS7 server. Older version runs on port 81, newer one on port 8080 (82,83 were checked as well).

When I'm trying to proxy second container and change port from 81 to 8080 I receive nginx error message (HTTP/1.1 502 Bad Gateway).

Nginx is not in a container. I just have it installed on the server.

Here is my proxy_pass setting:

location / {
         proxy_pass http://0.0.0.0:8080/;
        }

And some additional information:

nginx -t
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful

If I try to access containers directly via their ports everything works fine.

curl  0.0.0.0:81
{"msg":"Phone Masks service"}

curl  0.0.0.0:8080
{"msg":"Phone Masks service"}

nginx version: nginx/1.16.1

Docker version 19.03.4, build 9013bf583a

Full server config is pretty standard, I didn't change anything except proxy_pass setting

server {
       listen       80 default_server;
       listen       [::]:80 default_server;
       server_name  _;
       root         /usr/share/nginx/html;

       # Load configuration files for the default server block.
       include /etc/nginx/default.d/*.conf;

       location / {
        proxy_pass http://0.0.0.0:8080/;
       }

       error_page 404 /404.html;
           location = /40x.html {
       }

       error_page 500 502 503 504 /50x.html;
           location = /50x.html {
       }
   }

The command I use to start the container:

sudo docker run --rm -it -p 8080:8080 -e PORT="8080" api

sudo docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS                            NAMES
47ef127e3e49        api                 "/start.sh"         26 minutes ago      Up 26 minutes       80/tcp, 0.0.0.0:8080->8080/tcp   infallible_borg
5d5fe891ba30        api                 "/start.sh"         7 hours ago         Up 7 hours          80/tcp, 0.0.0.0:81->81/tcp       hopeful_cerf