location  @again404 {
       add_header 'X-fallback' $uri;
         root /var/www/html/s5ci;
         try_files $uri $uri/ =204;
    }
    location @tryif404 {
       # rewrite  ^(.*)/jobs/db/index.html$  $1/jobs/ break;
       rewrite  ^(.*)/index.html$  $1/ break;
       # don't cache the static files
       add_header 'Cache-Control' 'no-store, no-cache, must-revalidate, proxy-revalidate, max-age=0';
       add_header 'X-fallback' 'yes';
       add_header 'X-uri' $uri;

       expires off;
       proxy_pass http://kimsufi;
       proxy_intercept_errors on;
       error_page 404 = @again404;
    }

    location / {
       rewrite  ^(.*)/$  $1/index.html break;
       # don't cache the static files
       add_header 'Cache-Control' 'no-store, no-cache, must-revalidate, proxy-revalidate, max-age=0';
       add_header 'X-fallback' 'no';
       expires off;
       proxy_pass http://kimsufi;
       proxy_intercept_errors on;
       error_page 404 = @tryif404;
    }