fix: ERR_SSL_PROTOCOL_ERROR when using IP host.

nginx.conf

@@ -1,28 +1,61 @@
-events { }
+events {
+}
 http {
 
   include mime.types;
   sendfile on;
 
   server {
-      listen        24900;
-      listen        [::]:24900;
-      server_name   localhost;
+    listen 24900;
+    listen [::]:24900;
+    server_name localhost;
 
-      #error_page  404              /404.html;
-      root /usr/share/nginx/html;
+    #error_page  404              /404.html;
+    root /usr/share/nginx/html;
 
-      # direct all traffic to index.html for client-side SPA routing
-      location / {
-        try_files $uri $uri/ /index.html;
-      }
+    # direct all traffic to index.html for client-side SPA routing
+    location / {
+      try_files $uri $uri/ /index.html;
 
-      # redirect server error pages to the static page /50x.html
-      #
-      error_page   500 502 503 504  /50x.html;
-      location = /50x.html {
-          root   /usr/share/nginx/html;
+      # enable CORS
+      if ($request_method = 'OPTIONS') {
+        add_header 'Access-Control-Allow-Origin' '*';
+        add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
+        #
+        # Custom headers and headers various browsers *should* be OK with but aren't
+        #
+        add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range';
+        #
+        # Tell client that this pre-flight info is valid for 20 days
+        #
+        add_header 'Access-Control-Max-Age' 1728000;
+        add_header 'Content-Type' 'text/plain; charset=utf-8';
+        add_header 'Content-Length' 0;
+        return 204;
+      }
+      if ($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;
+      }
+      if ($request_method = 'GET') {
+        add_header 'Access-Control-Allow-Origin' '*' always;
+        add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS' always;
+        add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range' always;
+        add_header 'Access-Control-Expose-Headers' 'Content-Length,Content-Range' always;
       }
+    }
+
+    # redirect https to http
+    error_page 497 301 http://$http_host$request_uri;
+
+    # redirect server error pages to the static page /50x.html
+    #
+    error_page 500 502 503 504 /50x.html;
+    location = /50x.html {
+      root /usr/share/nginx/html;
+    }
   }
 
-}
+}