Add 301, 302, 404 per Rahul http://community.rtcamp.com/t/fascgi-cache-caching-error-pages/3847

config/nginx/conf.d/fastcgi.conf

@@ -3,7 +3,7 @@
 fastcgi_cache_path /var/run/nginx-cache levels=1:2 keys_zone=WORDPRESS:50m inactive=60m;
 fastcgi_cache_key "$scheme$request_method$host$request_uri";
 fastcgi_cache_use_stale error timeout invalid_header updating http_500 http_503;
-fastcgi_cache_valid 200 1h;
+fastcgi_cache_valid 200 301 302 404 1h;
 
 fastcgi_buffers 16 16k;
 fastcgi_buffer_size 32k;