Add config options to handle missing trailing slash in nginx

ui/container-files/etc/nginx/conf.d/default.conf

@@ -25,10 +25,6 @@ server {
     root   /usr/share/nginx/html;
     index  index.html index.htm;
 
-    # Modify this rule by removing '/ui' when the UI app is moved to the URL root dir '/' and the old Gateway App is decomissioned.
-    # And also you will need to update the base-href setting in the index.html file to '/'.
-    try_files /ui/en /ui/en/index.html;
-
     # Disable Caching
     sendfile off;
     add_header Last-Modified $date_gmt;
@@ -38,13 +34,24 @@ server {
     etag off;
 
     # The load balancer is Temporarily configured to forward all requests for '^/ui(.*)' to this nginx virtual host.
-    # This context path for this app will eventaully be changed to the root dir '/' and the Gateway will be decomissioned and all rewrites and location block will need to be re-assessed.
+    # This context path for this app will eventully be changed to the root dir '/' and the Gateway App will be decomissioned and all rewrites and location block will need to be re-assessed.
     # The following rewrite rule removes '/ui' from the uri so that files can be referenced relative to the document root path.
     # Requires `base href` in the static html files be set to "./" or "/ui/<langCode>/" {e.g "/ui/en/"} for this to work.
-    rewrite ^/ui/(.*)$ /$1 last;
-    location ~ ^/(cs|en|es|fr|it|ja|ko|pt|ru|zh-CN|zh-TW)/(.*) {
-      try_files $uri $uri/ /$1/index.html?$args;
+
+    # Temporary Rule, when the UI app is served from the root instead of `/ui` then this rewrite rule can be removed. 
+    rewrite ^/ui/(.*)$ /$1 last; 
+
+    # 1.)  / -> /en/index.html
+    try_files /ui/en/index.html /ui/en/index.html; 
+
+    # 2.) /<langCode> -> /<langCode>/index.html
+    location ~ ^/(cs|en|es|fr|it|ja|ko|pt|ru|zh-CN|zh-TW)$ { 
+      try_files $uri $uri/index.html /$1/index.html?$args; 
+    } 
+
+    # 3.) /<langCode>/ -> /<langCode>/index.html 
+    location ~ ^/(cs|en|es|fr|it|ja|ko|pt|ru|zh-CN|zh-TW)/(.*)$ { 
+      try_files $uri $uri/ /$1/index.html?$args; 
     }
-  }
 
 }