nginx.conf

server {
    listen       80;
    server_name  localhost;
    proxy_http_version 1.1;
    location / {
        proxy_pass          http://frontend:3000;
    }
    location /socket/v2 {
        proxy_pass http://backend:4000;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "Upgrade";
        proxy_set_header Host $host;
    }
    location /api/ {
        proxy_pass          http://backend:4000/api;
    }
}

server {
    listen       81;
    server_name  localhost;
    proxy_http_version 1.1;
    proxy_hide_header Access-Control-Allow-Origin;
    proxy_hide_header Access-Control-Allow-Methods;
    add_header 'Access-Control-Allow-Origin' 'http://localhost' always;
    add_header 'Access-Control-Allow-Methods' 'PUT, GET, POST, OPTIONS, DELETE, PATCH' always;

    location / {
        proxy_pass          http://backend:4000;
    }

    location /socket {
        proxy_pass http://backend:4000;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "Upgrade";
        proxy_set_header Host $host;
    }
}

server {
    listen       82;
    server_name  localhost;
    proxy_http_version 1.1;
    proxy_hide_header Access-Control-Allow-Origin;
    proxy_hide_header Access-Control-Allow-Methods;
    add_header 'Access-Control-Allow-Origin' 'http://localhost' always;
    add_header 'Access-Control-Allow-Credentials' 'true' always;
    add_header 'Access-Control-Allow-Methods' 'PUT, GET, POST, OPTIONS, DELETE, PATCH' always;

    location / {
        proxy_pass          http://stats:8050;
    }
    location /socket/v2 {
        proxy_pass http://backend:4000;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "Upgrade";
        proxy_set_header Host $host;
    }
}