Каким образом можно заставить nginx возвращать заголовок Last-Modified и воспринимать If-Modified-Since?

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Здравствуйте, господа. Установлена связка nginx + php-fpm. При обращении к статичному контенту (html, jpg и т.д.) заголовок Last-Modified возвращается нормально, но не воспринимается If-Modified-Since. Если же обращаюсь к динамичному контенту (php), то Last-Modified не возвращается и не воспринимается If-Modified-Since. Подскажите, пожалуйста, каким образом можно заставить nginx возвращать заголовок Last-Modified для php и воспринимать If-Modified-Since? В качестве средства проверки использую сайт http://last-modified.com/ru/if-modified-since.html.

Вот мой конфиг nginx:

user www-data www-data;
worker_processes 2;
worker_cpu_affinity 0101 1010;
worker_rlimit_nofile 8192;
worker_priority -5;
timer_resolution 100ms;
error_log /var/log/nginx/error.log warn;
pid /var/run/nginx.pid;

events {
    worker_connections 2048;
    multi_accept on;
    accept_mutex on;
    use epoll;
}

http {
    include mime.types;
    default_type application/octet-stream;
    index index.html index.htm index.php;

    upstream example.com {
        server unix:/var/run/php5-fpm_example.com.sock max_fails=3 fail_timeout=3s;
    }

    server {
        listen *:80;
        server_name example.com;
        root /home/example.com/www;
        access_log /var/log/nginx/access.log;

        location ~ ^.+\.php(?:/.*)?$ {
            fastcgi_pass example.com;
            include fastcgi_params;
            fastcgi_split_path_info ^(.+?\.php)(/.*)$;
            if ($uri ~ ^(?<script_name>.+\.php)?(?<path_info>/.*)?$) {}

            set $path_info_final $path_info;
            if ($fastcgi_path_info != '') {
                set $path_info_final $fastcgi_path_info;
            }

            fastcgi_param PATH_INFO $path_info_final;

            set $script_name_final '/index.php';
            if ($script_name != '') {
            set $script_name_final $script_name;
            }

            fastcgi_param SCRIPT_FILENAME $document_root$script_name_final;

            if (!-e $document_root$script_name_final) {
                return 404;
            }

            fastcgi_param SCRIPT_NAME $script_name_final;

            set $request_uri_final $request_uri;
            if ($path_info_final != '') {
                set $request_uri_final $path_info_final$is_args$args;
            }

            fastcgi_param REQUEST_URI $request_uri_final;
            fastcgi_index index.php;
            fastcgi_next_upstream error timeout;
            fastcgi_keep_conn on;
            fastcgi_hide_header "X-Powered-By";
        }

        location / {
            index index.html index.htm index.php;
            try_files $uri $uri/ /index.html /index.htm /index.php;
        }

        location /blog {
            try_files $uri $uri/ /blog/index.php?q=$uri&$args;
        }

        location ~ \.(htc|js|js2|js3|js4)$ {
            expires 31536000s;
            add_header Pragma "public";
            add_header Cache-Control "max-age=31536000, public, must-revalidate, proxy-revalidate";
        }

        location ~ \.(html|htm|rtf|rtx|svg|svgz|txt|xsd|xsl|xml)$ {
            expires 3600s;
            add_header Pragma "public";
            add_header Cache-Control "max-age=3600, public, must-revalidate, proxy-revalidate";
        }

        location ~ \.(asf|asx|wax|wmv|wmx|avi|bmp|class|divx|doc|docx|eot|exe|gif|gz|gzip|ico|jpg|jpeg|jpe|json|mdb|mid|midi|mov|qt|mp3|m4a|mp4|m4v|mpeg|mpg|mpe|mpp|otf|odb|odc|odf|odg|odp|ods|odt|ogg|pdf|pot|pps|ppt|pptx|ra|ram|svg|svgz|swf|tar|tif|tiff|ttf|ttc|wav|wma|wri|xla|xls|xlsx|xlt|xlw|zip)$ {
            expires 31536000s;
            add_header Pragma "public";
            add_header Cache-Control "max-age=31536000, public, must-revalidate, proxy-revalidate";
        }
    }
}