fix swagger docs (#1457)

Author: gugu

frontend/nginx/default.conf

@@ -1,4 +1,4 @@
-server {  
+server {
   listen 8080;
   server_name frontend;
   gzip on;
@@ -9,7 +9,7 @@ server {
     index  index.html index.htm;
     try_files $uri /index.html;
   }
-  location ~* /[^/]*\.(?:ico|css|js|gif|jpe?g|png|woff2)$ {
+  location ~* ^(?!/api)/[^/]*\.(?:ico|css|js|gif|jpe?g|png|woff2)$ {
         root   /var/www/html;
         try_files $uri =404;
         add_header Cache-Control "public, immutable, max-age=2592000";