“`

include /etc/nginx/mime.types;
default_type application/octet-stream;

Defines the cache log format, cache log location

and the main access log location.

log_format cache ‘***$time_local ‘
‘$upstream_cache_status ‘
‘Cache-Control: $upstream_http_cache_control ‘
‘Expires: $upstream_http_expires ‘
‘$host ‘
‘”$request” ($status) ‘
‘”$http_user_agent” ‘
‘Args: $args ‘
‘WordPress Auth Cookie: $wordpress_auth ‘;
access_log /var/log/nginx/cache.log cache;
access_log /var/log/nginx/access.log;

Proxy cache and temp configuration.

proxy_cache_path /var/www/nginx_cache levels=1:2
keys_zone=main:10m
max_size=1g inactive=30m;
proxy_temp_path /var/www/nginx_temp;

Gzip Configuration.

gzip on;
gzip_disable msie6;
gzip_static on;
gzip_comp_level 4;
gzip_proxied any;
gzip_types text/plain
text/css
application/x-javascript
text/xml
application/xml
application/xml+rss
text/javascript;

完整配置文件

user apache apache;
worker_processes 4;

error_log /var/log/nginx/error.log;

events {
worker_connections 1024;
}

http {
include /etc/nginx/mime.types;
default_type application/octet-stream;

# Defines the cache log format, cache log location
# and the main access log location.
log_format cache '***$time_local '
    '$upstream_cache_status '
    'Cache-Control: $upstream_http_cache_control '
    'Expires: $upstream_http_expires '
    '$host '
    '"$request" ($status) '
    '"$http_user_agent" '
    'Args: $args '
    'Wordpress Auth Cookie: $wordpress_auth '
    ;
access_log /var/log/nginx/cache.log cache;
access_log /var/log/nginx/access.log;

# Proxy cache and temp configuration.
proxy_cache_path /var/www/nginx_cache levels=1:2
                 keys_zone=main:10m
                 max_size=1g inactive=30m;
proxy_temp_path /var/www/nginx_temp;

# Gzip Configuration.
gzip on;
gzip_disable msie6;
gzip_static on;
gzip_comp_level 4;
gzip_proxied any;
gzip_types text/plain
           text/css
           application/x-javascript
           text/xml
           application/xml
           application/xml+rss
           text/javascript;

upstream backend {
    # Defines backends.
    # Extracting here makes it easier to load balance
    # in the future. Needs to be specific IP as Plesk
    # doesn't have Apache listening on localhost.
    ip_hash;
    server xxx.xxx.xxx.xxx:81; # IP goes here.
}

server {
listen xxx.xxx.xxx.xxx:80; # IP goes here.
    server_name fauna-flora.org www.fauna-flora.org xxx.xxx.xxx.xxx; # IP could go here.

    # Set proxy headers for the passthrough
    proxy_set_header Host $host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

    # Let the Set-Cookie header through.
    proxy_pass_header Set-Cookie;

    ## domain.org -> www.domin.org (301 - Permanent)
    if ($host ~* ^([a-z0-9]+\.org)$) {
        set $host_with_www www.$1;
        rewrite ^(.*)$
        http://$host_with_www$1 permanent;
    }

# Max upload size: make sure this matches the php.ini in .htaccess
    client_max_body_size 8m;

    # Catch the wordpress cookies.
    # Must be set to blank first for when they don't exist.
    set $wordpress_auth "";
    if ($http_cookie ~* "wordpress_logged_in_[^=]*=([^%]+)%7C") {
        set $wordpress_auth wordpress_logged_in_$1;
    }

# Set the proxy cache key
    set $cache_key $scheme$host$uri$is_args$args;

    # All media (including uploaded) is under wp-content/ so
    # instead of caching the response from apache, we're just
    # going to use nginx to serve directly from there.
    location ~* ^/(wp-content|wp-includes)/(.*)\.(gif|jpg|jpeg|png|ico|bmp|js|css|pdf|doc)$ {
        root /var/www/vhosts/fauna-flora.org/httpdocs;
    }

# Don't cache these pages.
    location ~* ^/(wp-admin|wp-login.php)

{
proxy_pass http://backend;
}

location / {
        proxy_pass http://backend;
        proxy_cache main;
        proxy_cache_key $cache_key;
        proxy_cache_valid 30m; # 200, 301 and 302 will be cached.
        # Fallback to stale cache on certain errors.
        # 503 is deliberately missing, if we're down for maintenance

we want the page to display.

        proxy_cache_use_stale error
                              timeout
                              invalid_header
                              http_500
                              http_502
                              http_504
                              http_404;
        # 2 rules to dedicate the no caching rule for logged in users.
        proxy_cache_bypass $wordpress_auth; # Do not serve response from cache.
        proxy_no_cache $wordpress_auth; # Do not cache the response.
    }

# Cache purge URL - works in tandem with WP plugin.
    location ~ /purge(/.*) {
        proxy_cache_purge main "$scheme://$host$1";
    }
} # End server

} # End http

[了解更多，查看来源](https://www.djm.org.uk/posts/wordpress-nginx-reverse-proxy-caching-setup/)