HTTP/2 lets a browser fetch many files over one connection, and HTTP/3 builds on a different transport to cope better with poor networks. Most hosts and content delivery networks offer both, usually with a setting rather than any code change.
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What changes for you
Faster, more reliable delivery can help load metrics, though gains depend on your pages. Old tricks like bundling every file into one can matter less under HTTP/2.
Checking support
Browser developer tools show the protocol per request. If you use a CDN, look for an HTTP/3 toggle in its settings.
Common mistakes
Expecting a ranking lift on its own
The protocol is a delivery detail. Any benefit comes through faster pages.
Frequently Asked Questions
Google documents which protocols its crawlers support. Check its crawler documentation for the current position.
Keep reading
- Content delivery network: A CDN is a network of servers worldwide that caches and serves a site's files close to each visitor, cutting load times and shielding the origin server.
- Time to First Byte: Time to First Byte measures how long a browser waits from requesting a page to receiving the first byte of the response. Every later metric waits on it.
- Core Web Vitals: Core Web Vitals are Google's three user-experience metrics: loading (LCP), responsiveness (INP) and visual stability (CLS).
- HTTPS: HTTPS is HTTP sent over an encrypted TLS connection. It protects visitors' data, is a lightweight Google ranking signal and is expected on every page.
- Crawl Budget: Crawl budget is the number of URLs a search engine is able and willing to crawl on a site in a given period.
- Crawl Stats Report: The Crawl Stats report in Google Search Console shows how Google crawls a site, including request volume, download size, response time, host status and response types.
- Crawl trap: A crawl trap is a part of a site that generates endless URLs, so crawlers waste time there instead of on your real pages.
- Critical CSS: Critical CSS is the minimal set of styles needed to render the visible top of a page, inlined in the HTML so the first paint does not wait on stylesheets.
