What it is
Sitting on HTTP/1.1 only means losing the multiplexing and efficiency of HTTP/2 and HTTP/3. Most CDNs offer the newer protocols for free, so there is little reason not to use them. Legacy HTTP/1.1 only. Misses multiplexing/perf gains. Enable HTTP/2+ at server/CDN.
Why does http/2 or http/3 not enabled matter for AI search?
Misses multiplexing/perf gains.
How do you fix it?
Enable HTTP/2+ at server/CDN.
How do you find it on your site?
- Check the protocol in the DevTools Network tab Protocol column.
- Confirm whether your server or CDN supports HTTP/2 and HTTP/3.
- Enable the newer protocols at the server or CDN level.
- Re-test that connections negotiate h2 or h3.
Which ranking and citation factors does it touch?
Newer protocols improve load efficiency, which indirectly supports Core Web Vitals. The gain is modest but free.
What is the impact?
Low. Inferred.
What is the evidence?
Modern protocols aid performance. web.dev, Core Web Vitals (Google)
Frequently asked questions about http/2 or http/3 not enabled
What does "HTTP/2 or HTTP/3 not enabled" mean?
Legacy HTTP/1.1 only.
How do you fix hTTP/2 or HTTP/3 not enabled?
Enable HTTP/2+ at server/CDN.