nginx.conf

user nginx;
worker_processes auto;
error_log /var/log/nginx/error.log;
pid /run/nginx.pid;

# Load dynamic modules. See /usr/share/doc/nginx/README.dynamic.
#include /usr/share/nginx/modules/*.conf;
include /etc/nginx/modules/*.conf;

events {
    worker_connections 1024;
}

http {
    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log  /var/log/nginx/access.log  main;

    sendfile            on;
    tcp_nopush          on;
    tcp_nodelay         on;
    keepalive_timeout   65;
    types_hash_max_size 2048;

    include             /etc/nginx/mime.types;
    default_type        application/octet-stream;

    # Load modular configuration files from the /etc/nginx/conf.d directory.
    # See http://nginx.org/en/docs/ngx_core_module.html#include
    # for more information.
    include /etc/nginx/conf.d/*.conf;

    upstream api_server {
        ip_hash;
        server api:8080;
    }

    server {
        listen       80 default_server;
        listen       [::]:80 default_server;
        http2  on;
        server_name  _;
        #root /home/debian/oni-ui/portal/dist;
        root  /var/www/oni-ui;
        index index.html;
        error_page  404 /index.html;

        #ssl_certificate "/etc/letsencrypt/live/domain/fullchain.pem";
        #ssl_certificate_key "/etc/letsencrypt/live/domain/privkey.pem";

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

        location / {
            try_files $uri $uri/ =404;
        }

        location /api/ {
            add_header 'Cache-Control' 'no-store, no-cache, must-revalidate, proxy-revalidate, max-age=0';
            proxy_set_header X-Forwarded-For $remote_addr;
            proxy_set_header X-Forwarded-Proto $scheme;
            proxy_set_header X-Real-IP  $remote_addr;
            proxy_set_header Host $host;
            proxy_set_header Via '1.1 nginx';
            proxy_set_header Nginx-Enabled-Modules zip;
            proxy_redirect off;
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "upgrade";
            proxy_send_timeout 120;
            proxy_read_timeout 120;
            send_timeout 120;
            proxy_pass http://api_server;
        }

        location /ocfl {
            internal;
            send_timeout 120;
            root /opt/storage/oni;
        }

        location /ocfl/previews {
            internal;
            root /opt/storage/oni/temp; # folder containing ocfl/previews directories
        }

#         location /socket.io/ {
#             proxy_http_version 1.1;
#             proxy_redirect off;
#             proxy_set_header Upgrade $http_upgrade;
#             proxy_set_header Connection "upgrade";
#             proxy_set_header        Host                    $host;
#             proxy_set_header        X-Real-IP               $remote_addr;
#             proxy_set_header        X-Forwarded-For         $proxy_add_x_forwarded_for;
#             proxy_pass http://api_server/socket.io/;
#         }

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

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


}