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Я изо всех сил пытаюсь преобразовать свой обратный прокси-сервер apache в nginx.

вот мои настройки apache

 <VirtualHost *:80>
    ServerAdmin webmaster@localhost
    ServerName IP_host
    DocumentRoot /var/www/html
    <Directory /var/www/html/>
            Options FollowSymLinks
            AllowOverride All
            Require all granted
    </Directory>
    ErrorLog /var/log/apache2/error.log
    CustomLog /var/log/apache2/access.log combined
    ProxyPass /.well-known !
    Alias /.well-known/pki-validation /etc/pki/validation
    <Directory /etc/pki/validation/>
            Options Indexes FollowSymLinks
            AllowOverride None
            Require all granted
    </Directory>
    ProxyVia Off
    ProxyRequests Off
    ProxyPreserveHost Off
    ProxyPass        / http://www.example.com/
    ProxyPassReverse / http://www.example.com/
    RequestHeader unset Accept-Encoding
    <Location "/">
    
            Header edit Location "example.com" "IP_host"
            SetEnv filter-errordocs
            AddOutputFilterByType SUBSTITUTE text/html
            AddOutputFilterByType SUBSTITUTE text/css
            AddOutputFilterByType SUBSTITUTE application/javascript
            AddOutputFilterByType SUBSTITUTE application/json
            Substitute "s/example.com/IP_host/in"
    </Location>
 

я попробовал эти настройки на nginx, но безуспешно

 server {
listen 80;

location / {
        # rewrite tag html link '{$IP_host}' '{host}'
        sub_filter '<a href="http://example.com' '<a href="http://$host';
        sub_filter_once off;

        proxy_pass http://example.com;
        #proxy_cache_bypass                 $http_upgrade;

        # Proxy headers
        # proxy_set_header Upgrade $http_upgrade;
        # proxy_set_header Connection "upgrade";
        proxy_set_header Host $host;
        # proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        # proxy_set_header X-Forwarded-Proto $scheme;
        # proxy_set_header X-Forwarded-Host $host;
        # proxy_set_header X-Forwarded-Port $server_port;

        # Proxy timeouts
        proxy_connect_timeout 60s;
        proxy_send_timeout 60s;
        proxy_read_timeout 60s;
}
 

я думаю, что пропустил замену html/css, но я не знаю, как включить ее в конфигурацию nginx