nginx.conf

server {
    listen 3000;
    server_name localhost;
    
    location / {
        root /usr/share/nginx/html;
        index listRegistry.json;
        try_files $uri $uri/ /listRegistry.json;
        
         if ($request_method = OPTIONS ) {
            add_header Content-Length 0;
            add_header 'Access-Control-Allow-Origin' '*';
            add_header 'Access-Control-Allow-Methods' 'GET, OPTIONS';
            add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range';
            add_header 'Access-Control-Max-Age' 1728000;
            add_header 'Content-Type' 'text/plain; charset=utf-8';
            add_header 'Content-Length' 0;
            return 204;
         }

        add_header 'Access-Control-Allow-Origin' '*';
        add_header 'Access-Control-Allow-Headers' 'Authorization,Accept,Origin,DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range';        
        add_header 'Access-Control-Allow-Credentials' 'true';
        add_header 'Access-Control-Allow-Methods' 'GET,OPTIONS';
        proxy_pass_header Content-Type;
    }
}