HTTP/3 (with QUIC)

Last updated Aug 14, 2026 HTTP/3 uses QUIC, which is a secure-by-default transport protocol. HTTP/3 improves page load times in a similar way to HTTP/2. However, the QUIC transport protocol solves TCP's head-of-line blocking problem, meaning that performance over lossy networks can be better.

Note

For more background on HTTP/3, visit the Learning Center ↗︎.

Note

This setting is for connection between the user and Cloudflare. HTTP/3 connection to the origin is not yet supported.

Availability

Enable HTTP/3

HTTP/3 is available to all plans (though it does require an SSL certificate at Cloudflare’s edge network).

To enable HTTP/3 in the dashboard:

1. Log into the Cloudflare dashboard ↗︎.
2. Select your account and zone.
3. Go to Speed > Settings.
4. Go to Protocol Optimization.
5. For HTTP/3, switch the toggle to On.

To enable HTTP/3 with the API, send a PATCH request with http3 as the setting name in the URI path, and the value parameter set to "on".

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description: Fix Enhanced HTTP/2 Prioritization issues on iOS and Safari. title: Enhanced HTTP/2 Prioritization negatively affects iOS/Safari devices image: https://developers.cloudflare.com/speed/optimization/protocol/troubleshooting/enhanced-http2-prioritization-ios-safari/og.png?v=6452e27b1e4a3cf1

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