core/nginx.conf

#user  nobody;
worker_processes  1;

#error_log  logs/error.log;
#error_log  logs/error.log  notice;
error_log  error.log  info;

#pid        logs/nginx.pid;


events {
    worker_connections  1024;
}

http {
    include       /usr/local/etc/nginx/mime.types;
    default_type  application/octet-stream;

    #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  logs/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    #keepalive_timeout  0;
    keepalive_timeout  65;

    #gzip  on;

    map $http_origin $allow_origin {
      ~^https?://(.*\.)?localhost:3000|new.discours.io|discours.io()(:\d+)?$ $http_origin;
      default "";
    }

    upstream localhost-8080 {
      server 0.0.0.0:8080;
    }

    server {
      listen       localhost:8000;
      #server_name localhost;
      #charset koi8-r;
      # access_log  logs/host.access.log  main;

      #location / {
        #    root   html;
        #    index  index.html index.htm;
        #}

      location / {
          gzip on;
          gzip_min_length  1100;
          gzip_buffers  4 32k;
          gzip_types    text/css text/javascript text/xml text/plain text/x-component application/javascript application/x-javascript application/json application/xml  application/rss+xml font/truetype application/x-font-ttf font/opentype application/vnd.ms-fontobject image/svg+xml;
          gzip_vary on;
          gzip_comp_level  6;

          proxy_pass  http://localhost-8080;
          http2_push_preload on;
          proxy_http_version 1.1;
          proxy_read_timeout 60s;
          proxy_buffer_size 4096;
          proxy_buffering on;
          proxy_buffers 8 4096;
          proxy_busy_buffers_size 8192;
          proxy_set_header Upgrade $http_upgrade;
          proxy_set_header Connection $http_connection;
          proxy_set_header Host $http_host;
          proxy_set_header X-Forwarded-For $remote_addr;
          proxy_set_header X-Forwarded-Port $server_port;
          proxy_set_header X-Forwarded-Proto $scheme;
          proxy_set_header X-Request-Start $msec;


          if ($request_method = 'OPTIONS') {
              add_header 'Access-Control-Allow-Origin' '*' always;
              add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
              #
              # Custom headers and headers various browsers *should* be OK with but aren't
              #
              add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range';
              add_header 'Access-Control-Allow-Credentials' 'true';
              #
              # Tell client that this pre-flight info is valid for 20 days
              #
              add_header 'Access-Control-Max-Age' 1728000;
              add_header 'Content-Type' 'text/plain; charset=utf-8';
              add_header 'Content-Length' 0;
              return 204;
            }

          if ($request_method = 'POST') {
              add_header 'Access-Control-Allow-Origin' '*' always;
              add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS' always;
              add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range' always;
              add_header 'Access-Control-Expose-Headers' 'Content-Length,Content-Range' always;
              add_header 'Access-Control-Allow-Credentials' 'true' always;
            }

          if ($request_method = 'GET') {
              add_header 'Access-Control-Allow-Origin' '*:' always;
              add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS' always;
              add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range' always;
              add_header 'Access-Control-Expose-Headers' 'Content-Length,Content-Range' always;
              add_header 'Access-Control-Allow-Credentials' 'true' always;
            }
          }

        # redirect server error pages to the static page /50x.html
        #
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }

        # proxy the PHP scripts to Apache listening on 127.0.0.1:80
        #
        #location ~ \.php$ {
        #    proxy_pass   http://127.0.0.1;
        #}

        # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
        #
        #location ~ \.php$ {
        #    root           html;
        #    fastcgi_pass   127.0.0.1:9000;
        #    fastcgi_index  index.php;
        #    fastcgi_param  SCRIPT_FILENAME  /scripts$fastcgi_script_name;
        #    include        fastcgi_params;
        #}

        # deny access to .htaccess files, if Apache's document root
        # concurs with nginx's one
        #
        #location ~ /\.ht {
        #    deny  all;
        #}
    }


    # another virtual host using mix of IP-, name-, and port-based configuration
    #
    #server {
    #    listen       8000;
    #    listen       somename:8080;
    #    server_name  somename  alias  another.alias;

    #    location / {
    #        root   html;
    #        index  index.html index.htm;
    #    }
    #}


    # HTTPS server
    #
    #server {
    #    listen       443 ssl;
    #    server_name  localhost;

    #    ssl_certificate      cert.pem;
    #    ssl_certificate_key  cert.key;

    #    ssl_session_cache    shared:SSL:1m;
    #    ssl_session_timeout  5m;

    #    ssl_ciphers  HIGH:!aNULL:!MD5;
    #    ssl_prefer_server_ciphers  on;

    #    location / {
    #        root   html;
    #        index  index.html index.htm;
    #    }
    #}
    # include /usr/local/etc/nginx/servers/*;
}