Your web server or CDN can include a "Last-Modified" date in its response headers to tell crawlers when your content was last changed. This header is currently missing.
Why this matters
AI crawlers and search engines use this date to decide whether to re-crawl your content. Without it, they may treat your pages as stale and crawl them less often, reducing how quickly updates get picked up.
How to fix it
If your server or CDN allows it, configure it to send a Last-Modified header on page responses. Many hosting platforms and web servers offer a setting or plugin for this; check your host's documentation for the exact steps.
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