HTTP/3 (with QUIC)

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

	Free	Pro	Business	Enterprise
Availability	Yes	Yes	Yes	Yes

Enable HTTP/3

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

Dashboard

To enable HTTP/3 in the dashboard:

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

API

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".