1st commit - refined 2019 cfg + AI made README (I despise writing docs so it was either letting AI write README or having none, sorry)

nginx/custom.d/cors

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+ # This is an NGINX configuration file written and used by me in order to enable CORS support.
+ #
+ # (c) Corrado Mulas <tlc@mulas.me>
+ #
+ # For the full copyright and license information, please view the LICENSE
+ # file that was distributed with this source code.
+
+#
+# CORS header support
+#
+# One way to use this is by placing it into a file called "cors_support"
+# under your Nginx configuration directory and placing the following
+# statement inside your **location** block(s):
+#
+#   include cors_support;
+#
+# As of Nginx 1.7.5, add_header supports an "always" parameter which
+# allows CORS to work if the backend returns 4xx or 5xx status code.
+#
+# For more information on CORS, please see: http://enable-cors.org/
+# Forked from this Gist: https://gist.github.com/michiel/1064640
+#
+
+set $cors '';
+set $http_origin '*';
+        set $cors 'true';
+
+
+                                        access_log off;
+                                        add_header Pragma public;
+expires 365d;
+ add_header Cache-Control "public, no-transform";
+
+if ($cors = 'true') {
+        add_header 'Access-Control-Allow-Origin' "$http_origin" always;
+        add_header 'Access-Control-Allow-Credentials' 'true' always;
+        add_header 'Access-Control-Allow-Methods' 'GET, POST, PUT, DELETE, OPTIONS' always;
+        add_header 'Access-Control-Allow-Headers' 'Accept,Authorization,Cache-Control,Content-Type,DNT,If-Modified-Since,Keep-Alive,Origin,User-Agent,X-Requested-With' always;
+        # required to be able to read Authorization header in frontend
+        #add_header 'Access-Control-Expose-Headers' 'Authorization' always;
+}
+
+if ($request_method = 'OPTIONS') {
+        # 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;
+}