Prevent API cache in Nginx Proxy

api.conf

location /api/ {
  # Proxy
  proxy_set_header                X-Real-IP $remote_addr;
  proxy_set_header                X-Forwarded-For $proxy_add_x_forwarded_for;
  proxy_pass                      http://127.0.0.1:3000/api/;

  proxy_redirect                  off;
  proxy_buffers                   32 16k;
  proxy_busy_buffers_size         64k;
  proxy_cache                     off;


  # Headers for client browser NOCACHE + CORS origin filter 
  add_header 'Cache-Control' 'no-store, no-cache, must-revalidate, proxy-revalidate, max-age=0';
  expires off;
  add_header    'Access-Control-Allow-Methods' 'GET, POST, OPTIONS' always;
  add_header    'Access-Control-Allow-Headers' 'Origin, X-Requested-With, Content-Type, Accept' always;

  allow all;
}