Конфигурация Nginx для 1С-Битрикс: сокеты Push and Pull, буферизация и лимиты памяти

# /etc/nginx/sites-available/{{domain}}.conf
# Upstream для Bitrix Push-Server NodeJS
upstream push_stream {
    server 127.0.0.1:8010;
}
upstream push_pub {
    server 127.0.0.1:8011;
}

server {
    listen 80;
    server_name {{domain}} www.{{domain}};
    return 301 https://{{domain}}$request_uri;
}

server {
    listen 443 ssl http2;
    server_name {{domain}};

    root /var/www/{{domain}}/public_html;
    index index.php index.html;

    ssl_certificate /etc/letsencrypt/live/{{domain}}/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/{{domain}}/privkey.pem;

    client_max_body_size {{client_max_body}};

    # Защита системных файлов Битрикс
    location ~* /\\.(ht|git|svn) { deny all; }
    location ~* ^/bitrix/modules/ { deny all; }
    location ~* ^/bitrix/local/modules/ { deny all; }
    location ~* ^/bitrix/php_interface/ { deny all; }
    location ~* ^/upload/support/not_image/ { deny all; }

    # Bitrix Push & Pull WebSocket проксирование
    location /bitrix/subws {
        proxy_pass http://push_stream;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_read_timeout 86400s;
    }

    # Bitrix Push & Pull Long-Polling
    location /bitrix/sub {
        proxy_pass http://push_stream;
        proxy_read_timeout 60s;
    }

    # Публикация событий (только localhost)
    location /bitrix/pub {
        proxy_pass http://push_pub;
        allow 127.0.0.1;
        deny all;
    }

    # Статика Битрикс
    location ~* ^/(bitrix|local)/(templates|components|gadgets|js|images)/.*\\.(css|js|gif|png|jpg|jpeg|ico|svg|woff2)$ {
        expires 30d;
        add_header Cache-Control "public, max-age=2592000";
        access_log off;
    }

    location ~* ^/upload/.*\\.(css|js|gif|png|jpg|jpeg|ico|svg|webp|avif)$ {
        expires 30d;
        add_header Cache-Control "public";
        access_log off;
    }

    location / {
        try_files $uri $uri/ @bitrix;
    }

    location @bitrix {
        fastcgi_pass unix:/run/php/php{{php_version}}-fpm.sock;
        include fastcgi_params;
        fastcgi_param SCRIPT_FILENAME $document_root/bitrix/urlrewrite.php;
    }

    location ~ \\.php$ {
        try_files $uri @bitrix;
        fastcgi_pass unix:/run/php/php{{php_version}}-fpm.sock;
        fastcgi_index index.php;
        include fastcgi_params;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        fastcgi_buffer_size 128k;
        fastcgi_buffers 256 16k;
        fastcgi_busy_buffers_size 256k;
        fastcgi_temp_file_write_size 256k;
        fastcgi_read_timeout 300s;
    }
}