Nginx Reverse Proxy for Wordpress with Caching

nginx_blog.conf

proxy_cache_path /var/nginx/cache levels=1:2 keys_zone=blog_cache:1m max_size=100m inactive=60m use_temp_path=off;

server{
    listen    80;
    server_name    example.com;

    # prevent forwarding of cookies
    proxy_set_header    Cookie               "";

    # prevent passing of WP cookie back to client
    proxy_hide_header       Set-Cookie;

    # hide a range of other, unimportant headers
    proxy_hide_header       link;
    proxy_hide_header       wpe-backend;
    proxy_hide_header       x-pingback;

    location  /blog/ {
        proxy_pass          https://exampleblog.wpengine.com:443/;
        proxy_set_header    Host                 exampleblog.wpengine.com;

        # strip /blog/ from the path
        rewrite /blog/(.*) /$1  break;

        # replace all instances of the WPEngine subdomain from the response
        subs_filter_types   text/html text/css text/xml;
        subs_filter         'exampleblog.wpengine.com' 'example.com/blog' gi;

    }

    # we cache all content for 60 minutes, ignoring WPEngine cache
    # headers but not caching most errors
    proxy_cache blog_cache;
    proxy_ignore_headers Cache-Control;
    proxy_cache_valid 200 302 60m;
    proxy_cache_valid 404     10m;
}