added try_files directive to avoid 404 error while refreshing pages in Web UI

Merge branch 'develop'

web/nginx.conf

@@ -33,6 +33,8 @@ http {
 		location / {
 			root   /var/www/html/web;
 			index  index.html index.htm;
+			# add try_files directive to avoid 404 error while refreshing pages
+			try_files $uri  /index.html;
 		}
 
 		#error_page  404              /404.html;