HTTP protocol test page

This page was loaded over HTTP/1.1.

This page demonstrates the differences in network activity when serving a page over different versions of HTTP. You can load it over:

To see the protocol used for all requests, open your browser's developer console, go to the network tab, right click the table header and enable the "Protocol" column:

Screen shot showing where to enable the protocol column in developer tools

The first request over HTTP/3 will use HTTP/2. The Alt-Svc ma value is set to 10 sec, so that you can see the reversion to HTTP/2 more easily. To make the browser forget the HTTP/3 Alt-Svc max-age for this domain, open it in a private browsing window.

Some resources to load so that you can see the behaviour of multiple TCP connections and pipelining for 1.1, and multiplexing for 2 and 3:



Note that caching is disabled for all requests - gotta make that network do its thing!

Check your domain's HTTP/3 config using http3check.net.

Built by Marcus Bointon

Sponsor Synchro on GitHub